A.J.S. 18S Instruction manual

MAINTENANCE
MANUAL
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INSTRUCTION
BOOK
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AND
for
1951
350 c.c. and
500 c.c.
A•J•S
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SPRING FRAME AND RIGID
SINGLE CILINDER MODELS
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PRICE 2/6 NETT
A•J• S
MOTOR
CYCLES
Proprietors: ASSOCIATED MOTOR CYCLE LIMITED
PLUMSTEAD • LONDON • S.E.18
EDITION CM-15
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WHEN CORRESPONDING REGARDING
SERVICE OR SPARES
ALWAYS QUOTE
THE COMPLETE ENGINE NUMBER
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(Including
Including all letters in it)
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THIS ENABLES US TO IDENTIFY THE MACHINE
EACH SERIAL OF FRAMES IS NUMBERED FROM ZERO
THEREFORE
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UPWARDS.
THE
QUOTATION
OF A
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FRAME NUMBER ONLY DOES NOT PERMIT A MACHINE
TO BE IDENTIFIED.
MAINTENANCE
MANUAL
AND INSTRUCTION BOOK
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A•J•S
1951
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SINGLE CYLINDER MOTOR CYCLES
Compiled and Issued by the Manufacturers :
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A • J • S MOTOR CYCLES
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(Proprietors: ASSOCIATED MOTOR CYCLES LIMITED)
Registered Offices :
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PLUMSTEAD ROAD, PLUMSTEAD
LONDON, S.E.18 .. ENGLAND
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Nearest Station :
WOOLWICH ARSENAL
(Southern Region Railway)
A• J • S
Factories :
BURRAGE GROVE and MAXEY ROAD
PLUMSTEAD, S.E.18
Telegrams and Cables: "ICANHOPIT, WOL-LONDON"
Telephone : WOOlwich 1 22 3 (5 Lines)
Codes : A.B.C. 5th and 6th Edition ; Bentley's; and Private Codes
MOTOR
All correspondence to :—
CYCLES, PLUMSTEAD ROAD,
Price : TWO SHILLINGS
A—A
EDITION CM-15
and
LONDON,
S.E.18
SIXPENCE
1951 A•J •S MODELS
MODEL
MODEL
MODEL
MODEL
16M RIGID FRAME
16MS SPRING FRAME
16MC COMPETITION RIGID FRAME
16MCS COMPETITION SPRING FRAME
500
500
500
500
MODEL
MODEL
MODEL
MODEL
18 RIGID FRAME
18S SPRING FRAME
18C COMPETITION RIGID FRAME
18CS COMPETITION SPRING FRAME
350
—
Bore 69 mm .
500
—
Bore 8 2 ·5 mm .
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350
350
350
350
Stroke 93 mm .
Capacity 34 7 c.c.
Stroke 93 mm .
Capacity 4 9 8 c.c.
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INTRODUCTION
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Motorcycling is one of the most economical and pleasurable modes of
transport. It is our sincere wish that every " A . J . S " owner
should obtain, from his mount, the service, comfort and innumerable miles
of low-cost travel that we have earnestly endeavoured to build into it.
However, it must be remembered that, although a motor cycle is of simple
design and construction, it is, nevertheless, a highly specialised piece of
engineering. In consequence, it must be intelligently and efficiently
maintained in order to provide unfailing reliability.
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In this book are non-technical instructions for carrying out all the maintenance operations likely to be called for in strenuous service and illustrations
are provided to assist. Neglect to make essential adjustments, only casual
attention to lubrication and the lack of periodical maintenance attention
will soon neutralise the best efforts of the designers and may bring needless
trouble to the owner.
We are always pleased to give " A . J . S " owners the full benefit
of our wide experience in matters relating to motor cycles of our manufacture and elsewhere will be found details of the particulars that should
be given us when making such an enquiry.
A . J . S MOTOR CYCLES
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1951
RIGID
16M and 18
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SPRING
16MS and 18S
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1951
RIGID
COMPETITION
16MC and 18C
1951
SPRING
COMPETITION
16MCS and 18CS
3
DATA
Identity
Make
Models
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…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
350 c.c.
…
…
…
…
… Scamped on left hand side of crankcase
Stamped on seat lug of main frame, on right hand side (below the saddle)
350 c.c. Models—69 mm. (approx.) (2 Fin.)
…
…
…
…
…
500 c.c. Models—82·5 mm. (approx.) (34 in.)
…
…
…
…
…
…
…
…
… One
Number of Cylinders (all models) …
Stroke
All Models—93 mm. (approx.) (3·65625 in.)
…
…
…
…
…
…
…
…
Engine capacity, in cubic centimetres
350 Models—51/16M, 51/16MS, 51/16MC and 51/16MCS—347
500 Models—51/18, 51/18S, 51/18C and 51/18CS—498
…
…
…
…
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Engine Number …
Frame Number …
Bore
…
…
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500 c.c.
A.J.S.
51/16M
51/16MS
51/16MC
51/16MCS
51/18
51/18S
51/18C
51/18CS
Brake Liners
Length
6 s in.
Width
Thickness
d in.
x in.
Brake liner rivets
Length
Material
8 in.
a in.
Copper
Location
4 (2 per brake)
Type
Head
Tubular
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Capacities
Quantity off
3½ in.
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Diameter
Radius
350 c.c.
500 c.c.
…
…
…
…
…
…
…
…
…
…
…
…
…
…
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Engine …
…
…
…
…
Engine …
…
…
…
…
Gear box
…
…
…
…
Front fork (each side)
…
…
Rear leg (each leg)*
…
…
Rear wheel fork hinge bearing* …
Fuel tank (Rigid and Spring frame)
Fuel tank (Competition) …
…
O i l tank
…
…
…
…
*O n Spring Frame Models only.
Tinmans No. 11
Quantity
per liner
6
British
Metric
21·170 cub. in.
30·380 cub. in.
1 pint
6½ fl. ozs.
3 fl. ozs.
1½ fl. ozs.
3 gallons
2¼ gallons
4 pints
347 c.c.
498 c.c.
568·2 c.c.
184·6 c.c.
85 c.c.
42·6 c.c.
13·638 litres
10·2285 litres
2·275 litres
Part
number
010440 (3836-2)
Part
number
000113 (STD-113)
Carburetter
Type …
…
…
…
Main jet size (no air filter fitted)
Main jet size (air filter fitted)
T hrot t l e valve size …
…
Jet taper needle position …
350
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
76AE/IAK
150
130
6/4
3rd notch
from top
500
89B/IAK
180
160
29/4
2nd notch
from top
Chain whip (all models)
Front chain
a in.
Rear chain
a to ½ in. *
Dynamo chain
¼ in.
*When no load on the saddle the rear chain whip on Spring Frame Models is 1 8 in.
4
Magneto chain
¼ in.
Chains
Pitch
Location
350 Competition
…
…
350 Touring …
…
…
…
…
500 Competition
500 Touring
…
…
A l l rigid models (Touring) …
All spring models
…
…
All competition rigid models
All models
…
…
…
All models
…
…
…
…
…
…
…
…
…
…
…
…
Front driving
Front driving
Front driving
Front driving
Rear driving
Rear driving
Rear driving
Dynamo
Magneto
½ in.
½ in.
½ in.
½in.
s in.
s in.
s in.
a in.
a in.
Width
·305 in.
·305 in.
·305 in.
·305 in.
·380 in.
·380 in.
·380 in.
·225 in.
·225 in.
Number
of Links
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Compression ratios
W i t h one
compression plate
W i t h no
compression plate
Model
5·88 to 1
6·00 to 1
6·35 to 1
7·24 to
350
500
Gear box ratios
First gear
1 to 2·67
1 to 3·16
1 to 2·67
Third gear
1 to 1·76
1 to 2·09
1 to 1·69
1 to 1·28
1 to 1·28
1 to 1·25
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…
…
…
Second gear
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Standard
…
…
Competition (Rigid) …
Competition (Spring)
110046-65
110046-66
110046-66
110046-67
110056-94
110056-98
110056-90
110038-49
110038-58
65
66
66
67
94
98
90
49
58
DYNAMO AND MAGNETO CHAINS ARE ENDLESS. " NUMBER OF
LINKS " OF FRONT AND REAR DRIVING CHAINS INCLUDE ONE
SPRING CONNECTING LINK PER CHAIN.
Part
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Models
Second gear
Third gear
18·69 to
17·5 t o
16·44 to
15·57 to
14·6 to
14·01 to
13·35 to
12·32 to 1
11·54 to 1
10·84 to 1
10·26 to 1
9·6 to 1
9·24 to 1
8·8 to 1
8·96 to
8·39 to
7·88 to
7·47 to
7·0 to
6·72 to
6·4 to
Fourth gear (top)
1 to 1
1 to 1
1 to 1
Gear ratios (models 16M-16MS-18-18S)
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
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teeth
teeth
teeth
teeth *
teeth
teeth
teeth †
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15
16
17
18
19
20
21
First gear
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Engine sprocket size
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Fourth gear
(top)
7
6·56
6·16
5·83
5·49
5·25
5·0
to
to
to
to
to
to
to
1
1
1
1
1
1
1
Part
number
014015
014016
014017
014018
014019
014020
014021
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*Standard Solo sprocket for Models 16M and 16MS.
†Standard Solo sprocket for Models 18 and 18S.
Gear ratios (models 16MC-18C)
First gear
Engine sprocket size
15
16
17
18
19
20
21
teeth
teeth *
teeth
teeth †
teeth
teeth
teeth
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
22·12 to
20·72 to
19·46 to
18·44 to
17·34 to
16·59 to
15·8 to
1
1
1
1
1
1
1
Second gear
Third gear
Fourth gear
(top)
Part
number
14·63 to 1
13·71 to 1
12·87 to 1
12·20 to 1
11·47 to 1
10·97 to 1
10·45 to 1
8·96 to
8·39 to
7·88 to
7·47 to
7·0 to
6·72 to
6·4 to
7 to
6·56 to
6·16 t o
5·83 to
5·49 to
5·25 to
5·0 to
014015
014016
014017
014018
014019
014020
014021
* Standard Solo sprocket for Model 16MC.
† Standard Solo sprocket for Model 18C.
5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Gear ratios (models 16MCS and 18CS)
15
16
17
18
19
20
21
First gear
teeth
18·69 to 1
…
…
…
teeth *
17·5 to 1
…
…
…
teeth
16·44 to 1
…
…
…
teeth †
15·57 to 1
…
…
…
teeth
…
…
…
14·6 to 1
teeth
14·01 to 1
…
…
…
teeth
…
…
…
13·35 to 1
* standard Solo sprocket for Model 16MCS.
† standard Solo sprocket for Model 18CS.
Fourth gear
(top)
Third gear
Second gear
8·75
8·2
7·7
7·28
6·86
6·56
6·25
11·83 to 1
11·08 to 1
10·41 to 1
9·85 to 1
9·27 to 1
8·87 to 1
8·45 to 1
to
to
to
to
to
to
to
7 to 1
6·56 to 1
6·16 t o 1
5·83 to 1
5·49 to 1
5·25 to 1
5.0 t o 1
1
1
1
1
1
1
1
Ignition (magneto)
Make
Lucas
Type
N1-4
Rotation
Anti-clock
Point gap
·012 in.
Lucas
NR1
Anti-clock
·012 in.
Ignition (sparking plug)
Model
All
…
…
Make
K.L.G.
Type
FE80
Lighting (dynamo)
Type
E3-N
Lighting (bulbs)
Location
Voltage
6
m
Double filament
Single contact
Single contact
Single contact
…
…
…
…
Point gap
·015 to ·018 i n .
Part number
20028-A
Voltage
Wattage
Cap
Part
number
6
6
6
6
30X24
3
3
1·8
Special
M.B.C.
M.B.C.
M.B.C.
312
988
988
53205
…
…
…
…
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…
…
…
½ in. (39°)
Rotation
Anti-clock
Type
Head lamp (Pre-focus)
Pilot
…
…
…
Rear lamp…
Speedometer
…
Ignition point before top
dead centre (with control
in fully advanced position)
½ in. (39°)
Reach
¾ in.
Thread
14 mm.
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Make
Lucas
014015
014016
014017
014018
014019
014020
014021
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Model
16M-16MS-18
18S
16MC-18C
16MCS-18CS
Part
number
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Engine sprocket size
Oversize parts
The following are the only " oversize " variations provided for the 350 and 500 c.c. Single Cylinder machines.
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Big-end rollers :
·001 in. oversize
Cylinder re-bore :
·020 in. and ·040 in. oversize
Pistons and rings :
·020 in. and ·040 in. oversize
Pistons
Model
350
500
Top of skirt diameter
Bottom of skirt diameter
2·7176 in.
…
…
2·7180 in.
3·2490 in.
3·2494 in.
…
…
A ll above measurements are subject to a toleration limit of + or — ·0005 in.
Part number
013504
013505
Piston rings
Piston ring gap—Normal
…
…
Permissible maximum
Piston ring clearance in groove
…
…
…
…
…
…
…
…
…
…
6
…
…
…
…
…
…
…
…
…
…
…
…
…
…
…
·006 in.
·030 in.
·002 i n .
Spokes (350 and 500 rigid and spring frame models)
Location
Gauge
Type
Front, left side
Front, right side
Rear, left side
Rear, right side
…
…
…
…
…
…
…
…
…
…
…
…
Butted
Butted
Butted
Butted
…
…
…
…
Length
underhead Quantity
8 x10
9 x 11
7x9
7x9
5 x in.
8 8 in.
011018
011014
011012
011012
20
20
20
20
8 8 in.
8 8 in.
Part
number
(37-X-H51)
(12399)
(39-8-H54)
(39-8-H54)
Spokes (350 and 500 Competition models)
…
…
…
…
…
…
…
…
Gauge
Butted
Butted
Butted
Butted
8 x 10
9 x 11
6
6
Sprockets (engine)
Number Chain
of teeth pitch
Model
16MC
16MCS
16M
16MS
18C
18CS
18
18S
Length
underhead
Chain
width
Part
number
…
…
…
16
½ in.
·305 in.
014016
…
…
…
…
18
½ in.
·305 in.
014018
…
…
…
…
21
½ in.
·305 in.
014021
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Number Chain
of teeth pitch
…
…
…
…
…
40
40
16
16
42
½ in.
½ in.
s in.
s in.
s in.
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Clutch
Clutch
Gear box
Gear box
Rear wheel
…
…
…
…
…
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Location
012786
017111 (38-18T-H51)
017097 (36-2-H51)
017097 (36-2-H51)
20
20
20
20
6¼ in.
9 x in.
8 8 in.
8 8 in.
…
Sprockets
Part
number
Quantity
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Front, left side
Front, right side
Rear, left side
Rear, right side
Type
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Location
Chain
width
Part
number
·305 in.
·305 in.
·380 in.
·380 in.
·380 in.
7-X-28
G4-2
179-X-7
22BA-14
010293
Models
All except Competition Spring Frame
Competition Spring Frame
All except Competition Spring Frame
Competition Spring Frame
All
Valve timing (with ·016 inch rocker clearance)
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INLET VALVE
Opens before top dead centre …
Closes after bottom dead centre
…
…
EXHAUST VALVE
Opens before bottom dead centre
…
Closes after top dead centre
32°
63°
…
65°
30°
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Valve timing pinion
Retained by nut, threaded v in. by 26 threads per in.
Left hand thread.
Part number 000221 (STD-221).
Weight
Weight of machine w i t h empty tanks
Standard
Model
Rigid frame
350
500
…
…
…
…
…
…
Spring frame
Competition
Rigid frame
375 lbs.
386 lbs.
300 lbs.
303 lbs.
344 lbs.
353 lbs.
Wheels (bearing end play)
Bearing end play
…
…
…
·002 in.
7
CONTROLS
(1) Throttle twist grip. On right handlebar.
fully closed engine should just idle when hot.
Twist inwards to open.
When
(2) A i r lever. Small lever on right handlebar. Pull inwards to increase air supply
to carburetter. Once set, when engine has warmed up, requires no alteration
for different road speeds. Should be fully closed when starting engine from cold.
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(3) Ignition lever. Small lever on left handlebar. Advances and retards ignition
point. Pull inwards to advance on touring models (retard on competition models).
Retard two-fifths of total movement for starting.
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(4) Valve lifter lever. Small lever close to clutch lever. Lifts exhaust valve from
seat, releasing compression in combustion chamber, enabling engine to be easily
rotated for starting. Also used for stopping engine if throttle stop is set as
advised above.
(5) Clutch lever. Large lever on left handlebar. Grip to release clutch so that
drive to rear wheel is disconnected. Used when moving away from a standstill
and when changing gear.
(6) Front brake lever. Large lever on right handlebar. Grip to operate front
wheel brake and, for normal braking, use in conjunction with rear brake application.
(7) Rear brake lever. Pedal close to left side foot rest. Depress with left foot to
apply rear brake. Apply gently and use increasing pressure as the road speed
decreases.
Vertical pedal on right hand side of gear box.
Operated
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(9) Kick-starter lever.
to start the engine.
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(8) Gear change lever. Pedal in horizontal position close to right foot rest. Controls selection of the four speeds, or ratios, between engine and rear wheel
revolutions, with a " free," or neutral, position. See illustration 3.
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(10) Lighting switch. In top of head lamp. Controls lamps by a rotating lever which
has three positions :
(1) " O F F " Lamps not on.
(2) " L "
Pilot bulb in head lamp and rear lamp and speedometer lamp on.
(3) " H "
Head and rear lamp and speedometer lamp on.
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( I I ) Ammeter. In top of head lamp. Indicates flow of electric current, in, or out,
of battery. (" Charge " or " Discharge.")
(12) Horn switch.
Press switch on right handlebar.
Depress button to sound horn.
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(13) Gear box filler cap. Located on top edge of kick-starter case cover.
insertion of lubricant and access to clutch inner wire.
(14) Footrest for rider.
Allows
One located each side of machine.
(15) Petrol tank filler cap. Located in top of fuel tank. To release, slightly depress,
turn fully to the left, and then lift away. There are two locking positions. The
middle position, between the fully tightened down and " lift away " positions,
is in the nature of a " safety " device to prevent loss that might be occasioned by
unauthorised meddling.
(16) Oil tank filler cap. Located on top edge of oil tank.
operation is exactly as the petrol tank filler cap.
The construction and
(17) Dipping switch. Trigger switch on left handlebar. Used to select normal or
" dipped " beam of head lamp when main lighting switch lever is in the " H "
position. (The head lamp bulb has two filaments.)
8
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If any adjustment is made to the rear brake pedal make certain the brake does not bind
and also see there is not excessive free pedal movement before the brake comes " on."
Illustration 1
Showing Controls
Before using the machine, sit on the saddle and become familiar with the position and
operation of the various controls. Pay particular attention to the gear positions.
B—A
9
DRIVING
FUEL
At the time of publishing this instruction book only one grade of motor fuel (Pool Spirit)
is on sale, but it may be that soon the various grades of pre-war petrol will again be available when the use of best quality fuel is recommended because the small amount of
economy that might be considered to accrue by using the cheaper grades is more than
offset by the advantages obtained by using only Number One grades.
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FUEL SUPPLY
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Two fuel feed taps are situated underneath the rear end of the petrol tank. (One each
side.) Both must be shut off when the machine is left standing for more than a few
minutes.
The tap plungers work horizontally. To open, the hexagon knob (marked " push on ")
is pushed towards the body of the tap. To close, press the round milled knob (marked
" push off ").
Normally, only use the tap on the right hand side of the machine and then the other
side will act as a reserve supply. Always re-fuel as soon as possible after being forced
to call upon the reserve, and then, at once, close the " reserve " tap.
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It will be noted that, by fitting two petrol feed taps, it is possible to remove the petrol
tank from the machine without the necessity of first draining it of fuel.
Illustration 2
Kick-starter
quadrant and ratchet pinion
10
STARTING THE ENGINE
(a) See that there is sufficient fuel in the petrol tank.
(b) See that there is sufficient oil in the oil tank.
(c) See that the gear pedal is in the neutral position.
(d) Push inward the hexagonal end of off-side petrol tap slide.
(e) See that the air control lever is in the fully closed position.
(f)
Fully advance the ignition and then slack back the control lever two-fifths of its
total movement.
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(g) Open the throttle not more than one-sixth of the total movement of the twist grip.
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(h) Depress the plunger on the top of the carburetter float chamber until it can be
felt the chamber is full of petrol.
(i)
Raise the valve lifter lever and, while keeping it raised, turn over the engine several
times by depressing the kick-starter pedal, three times, the object being to free
the engine. (This only applies if the engine is cold.)
(j)
Depress the kick-starter until compression is felt, then raise the valve lifter lever
and ease the engine just over compression. Then, after allowing the kick-starter
pedal to return nearly to its normal position, give it a long swinging kick with the
valve closed and the engine should immediately fire.
The kick-starter mechanism must be allowed to engage properly before putting heavy
pressure on the kick-starter crank pedal pin. That means there are two definite
and separate movements when operating the mechanism by depressing the crank.
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The first is a slow and gentle movement which ends when it is felt the quadrant has
engaged with the teeth on the ratchet pinion. (See illustration 2.)
Illustration 3
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Showing the relative
positions taken up by the
moving
gear
indicator
when the various gears are
engaged.
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The moving gear indicator
is attached to the control
spindle and the fixed gear
indicator is located on the
kick-starter case cover.
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T h e t w o indicators are
only in line w i t h each
other when the foot gear
change pedal is in the
neutral position.
The first slow and gentle movement is essential to avoid damage to the teeth of the
kick-starter quadrant.
After the engine has started, slowly open the air lever until it runs evenly. Then set
the throttle so that the engine is running at a moderate speed (neither racing nor ticking
over) and allow to warm up. While doing this, check the oil circulation as detailed in
page 14. The machine can then be taken on the road,
NOTE—Do not race up the engine from cold and do not flood the carburetter to such
an extent that petrol is dripping, because then, in the event of a backfire, there
is a danger of such loose petrol igniting. This cannot possibly happen if the
starting instructions are carefully followed, but, in the event of a fire, there is
no cause for panic. Merely turn off the petrol tap to isolate the main supply,
open wide the throttle and turn over the engine by operating the kick-starter
pedal when suction will extinguish the fire.
11
STOPPING THE ENGINE
To stop the engine, close the throttle, raise the valve lifter lever and keep it raised
until the engine has ceased to revolve.
ON THE ROAD
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Having started and warmed up the engine, take the machine off the stand, sit astride it,
free the clutch by pulling up the large lever on the left bar and engage the lowest gear.
Next, slowly release the clutch lever and the machine will commence to move forward.
As it does this, the engine speed will tend to drop as it picks up the load so it will be
necessary to increase slightly the throttle opening, bit by bit, to keep the engine speed
gently rising.
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When well under way, disengage the clutch, slightly close the throttle, engage second
gear and release the clutch lever, then open up the throttle to increase the speed of
the machine. Repeat these operations in order to engage third and top gears.
To engage a higher gear the pedal is pressed downward with the toe and a lower gear is
obtained by raising the pedal with the instep. To engage first gear from the neutral
position, the pedal is therefore raised. After each pedal movement, internal springs
return the pedal to its normal horizontal position.
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The pedal must be moved to the full extent of its travel when selecting a gear, either
up or down. It must not be " stamped down " or jabbed, but firmly and decisively
moved till it stops. A half-hearted movement may not give full engagement. Keep
the foot off the pedal when driving and between each gear change because, unless the
lever can freely return to its normal central position, the next gear cannot be engaged.
Finally, fully advance the ignition and leave it in that position unless it is necessary to
retard in order to ease the engine and so prevent " pinking " when pulling hard on a
gradient.
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STOPPING THE MACHINE
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To stop the machine, close the throttle, declutch by lifting the large lever on the left
handlebar, and gently apply both brakes, increasing the pressure on them as the road
speed of the machine decreases. Place the gear change foot pedal in the neutral position
and stop the engine.
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Before leaving the machine, turn off the fuel supply.
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I M P O R T A N T NOTICE
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NEVER DRIVE AWAY AT HIGH SPEED WHEN STARTING A RUN WITH A
COLD ENGINE. GIVE THE OIL A CHANCE TO WARM UP AND THIN OUT,
PARTICULARLY WHEN THE MACHINE IS COLD. UNTIL THE OIL REACHES
ITS
NORMAL
RUNNING
TEMPERATURE
THE
CIRCULATION
IS
RESTRICTED. SEIZURES CAN BE A V O I D E D BY TAKING THIS SIMPLE
ESSENTIAL PRECAUTION.
RUNNING IN
Although it is customary to quote permitted maximum speeds on the various gears
during the period of running in, these are really no guide to overdriving, the only essential
thing to avoid being the use of large throttle opening.
If the precaution is taken of limiting the use of the throttle to about one-third of its
opening during the first 1,000 miles, irrespective of the road speed, and whether on the
level or climbing, the necessary conditions for running in will have been observed.
12
Special attention must be given, during the running in period, to such details as valve
rocker adjustment, chains, brakes, contact breaker points, and steering head bearings,
all of which tend to bed down in the first hundred miles or so. Particular note must be
made of the adjustment of steering head bearings, which, if run in a slack condition, will
be quickly ruined. After this bedding down process has taken place, adjustments to
such details will probably only be necessary at lengthy intervals.
After about 1,000 miles have been covered larger throttle openings may be gradually
indulged in for short bursts only.
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Until at least 2,000 miles have been covered the owner of a new machine is strongly
advised to curb his natural desire to learn the mount's maximum capabilities. Restraint
in this direction will be amply repaid later.
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NOTES ON DRIVING
If, at first, the lowest gear will not engage, release the clutch lever and after a second or
two, make another attempt. This condition may exist in a new machine, but it tends to
disappear after a little use,
Always endeavour to make the movements of hand (on the clutch) and foot (on the gear
pedal) as simultaneous as possible, and remember, in all gear changes, a steady pressure
of the foot is desirable. This pressure should be maintained until the clutch is fully
released. It is not sufficient just to jab the foot pedal and then release the clutch lever.
When actually in motion, it will be found sufficient to merely free the clutch a trifle,
to ease the drive when changing gear and, with reasonable care, changes of gear then
can be made without a sound.
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Do not unnecessarily race the engine or let in the clutch sufficiently suddenly to cause
the rear wheel to spin. Take a pride in making a smooth get-away.
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When changing up to a higher gear, as the clutch is freed, the throttle should be slightly
closed so that the engine speed may be reduced to keep in step with the higher gear ratio.
Conversely, when changing down to a lower gear, the throttle should be regulated so
that the engine speed is increased to keep in step with the lower gear ratio.
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Do not slip the clutch to control the road speed.
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The clutch must only be used when starting from a standstill and when changing gear
It must N O T be operated to ease the engine, instead of changing gear, or be held out,
in order to " free-wheel."
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The exhaust valve lifter is N O T used in normal driving on main and secondary roads.
When travelling slowly, such as may occur in traffic or on a hill, and the engine commences
to labour, it is then necessary to change to a lower gear. Engine " knocking " or
" pinking " and a harshness in the transmission are symptoms of such labour and although
relief can sometimes be found by retarding the ignition, it is generally much better to
change down. A good driver is able to sense such conditions and will make the change
before the engine has reached the stage of distress. The gear box is provided to be
used and consequently full use should be made of the intermediate gears to obtain
effortless running and smooth hill climbing.
Keep the feet clear of the brake and gear pedals when not actually using them and keep
the hand off the clutch lever when not in use.
Drive as much as possible on the throttle, making the minimum use of the brakes.
When using the machine on wet or greasy roads, it is generally better to apply BOTH
brakes together, because sudden or harsh application of either brake only, under such
conditions, may result in a skid.
In all conditions, it is advisable to make a habit of always using both brakes together
rather than habitually using the rear brake and reserving the front brake for emergency.
13
CHECKING OIL CIRCULATION
Provision is made to observe the oil in circulation and it is advisable to do this before
each run.
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If the filler cap on the oil tank is removed the bent over end of the oil return pipe will
be noticed some two inches below the level of the filler cap orifice and the returning
oil can be seen running from it. This check should be made Immediately after starting
the engine from cold. This is because while the engine is stationary, oil from all parts
of the interior of the engine drains back into the crankcase sump, so that, until this surplus
is cleared, the return flow is very positive and continuous. Therefore, if the oil circulation is deranged, the fact is apparent at once by the lack of a steady return flow.
Illustration 4
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Showing the oil tank with the felt
filter in its cylindrical housing and
the metal strainer mounted on the
entry end of the feed pipe union.
Also shows the direction of flow of
oil from tank to engine and return
flow from engine to tank via the small
spout, located so that it can be
inspected by removing the tank
filler cap. An air vent pipe is located
in the back of the oil tank to ensure
freedom from air-locks.
For
the
convenience
of Owners,
SPARES
S T O C K I S T S are appointed for most districts.
To save delay, and
the
delivery surcharge,
customers are recommended to apply to t h e i r
nearest Agent or spares stockist.
14
LUBRICATION
LUBRICANTS TO USE
Efficient lubrication is of vital importance and it is false economy to use cheap oils and
greases.
We recommend the following lubricants to use in machines of our make :
SUMMER
WINTER
(SAE-50)
(SAE-60)
(SAE-60)
(SAE-60)
(SAE-50)
Mobiloil A
Castrol XL
Price's Energol 30
Essolube 30
Double Shell
(SAE-30)
(SAE-30)
(SAE-30)
(SAE-30)
(SAE-30)
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Mobiloil D
Castrol "Grand Prix"
Price's Energol 60
Essolube " R a c e r "
Triple Shell
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FOR ENGINE LUBRICATION
FOR GEAR BOX LUBRICATION
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Mobiloil D
Castrol Grand Prix
Price's Energol 60
Essolube 50
Triple Shell
(SAE-50)
(SAE-60)
(SAE-60)
(SAE-50)
(SAE-50)
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FOR HUB LUBRICATION AND ALL FRAME PARTS USING GREASE
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Mobilgrease No. 2
Castrolease Medium
Price's Belmoline C
Esso Grease
Shell Retinax Grease C.D.
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FOR TELEDRAULIC FRONT FORKS AND TELEDRAULIC REAR LEGS
Mobiloil Arctic
Castrolite
Price's Energol 20
Essolube 20
Single Shell
(SAE-20)
(SAE-20)
(SAE-20)
(SAE-20)
(SAE-20)
FOR REAR CHAINS
Tallow
When buying oils and greases it is advisable to specify the Brand as well as the grade
and, as an additional precaution, to buy only in sealed containers or from branded cabinets.
15
FILLING THE GREASE GUN
The standard grease gun consists of a barrel having a spring loaded end cap, to which
is fixed a central steel piston in the shape of a long rod. This piston fits into a small
cylinder made in one with the screwed top cap, on the end of which is the cupped nozzle
that fits over the grease nipples. In the barrel of the gun, and sliding on the central
piston rod, is a cork piston.
The grease must be filled on the TOP of the cork piston. The gun may be filled by
inserting the grease in the barrel of the gun by means of a lath or similar " spoon."
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However, it is better to obtain the grease packed in the special containers that are
supplied, having loose collars in which are holes so that, by placing the barrel of the gun
over the hole of the central floating plate and pressing downwards, the gun is instantly
charged with grease. Twisting the gun, and, at the same time, taking it away from the
floating plate, leaves the top of the gun barrel flush with grease, and then all that remains
to be done is to replace the screwed top cap.
ENGINE LUBRICATION SYSTEM
This is by dry sump system. Oil feeds, by gravity, from the oil tank to the pump in the
crankcase. The pump forces oil to various parts, which then drains to the bottom of
crankcase sump. The pump then returns oil to the tank. This process is continuous
while the engine is revolving. The pump is designed to return more oil to the tank
than it can force into the engine. Therefore the crankcase sump is kept clear of excess oil.
A felt cartridge filter, in the oil tank, removes foreign matter collected by the oil in its
passage through the engine. A metal gauze strainer is fitted to the oil feed pipe in the
oil tank to prevent pieces of fluff, etc., which may find their way into the tank when
replenishing, from entering the oil pump. (See Illustration 4.)
ENGINE OIL PUMP
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Felt filter and metal strainer should be cleaned in petrol each time the oil tank is drained.
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The pump has only one moving part. This is the plunger which revolves and reciprocates.
Rotation is caused by the worm gear on the timing side flywheel axle. Reciprocation
It caused by the guide pin which engages in the profiled groove cut on the plunger.
Oil is fed to the pump through the lower of the two oil pipes between tank and crankcase and Is returned through the upper pipe.
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If, for any reason, the crankcase halves are separated, the oil pump plunger must
be removed f r o m its housing before a t t e m p t i n g to separate t h e crankcase
helves.
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ENGINE OIL CIRCULATION
The oil pump forces oil through :—
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(a) A passage cut through the timing side flywheel axle, timing side flywheel and crank
pin to lubricate the big-end bearing. The splash passes to interior of cylinder, to
lubricate the cylinder and piston, and then falls into the crankcase sump.
(b) A passage in crankcase, controlled by ball valve, direct to the cylinder, to assist in
cylinder and piston lubrication and then falls into the crankcase sump.
(c) A passage in timing gear case where it " builds up " to a predetermined level to
lubricate the timing gears and then falls into the crankcase sump.
(d) Through a pipe from the front of oil pump housing to the rocker box by which
all rocker gear and valve stems are lubricated and then falls through the push rod
cover tubes and tappet guides to the timing gear case and, from there, drains into
the crankcase sump, as detailed in Para. (c).
The oil pump extracts oil in the crankcase sump and returns it to oil tank.
It passes through the felt cartridge filter located in the oil tank.
16
On its way
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Engine Oil Circulation
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Illustration 5
THE OIL TANK A N D FILTERS
The level of oil in the supply tank should never be allowed to fall below the low level
mark and, upon replenishment, should not be higher than one inch from the filler cap
orifice, otherwise, when starting the engine, the bulk of oil in the crankcase sump may be
greater than the space available in the tank.
The oil filter is made in cylindrical form of thick felt and is supported by a tubular wire
cage. The felt is not detachable from the cage.
C—A
17
A metal gauze strainer (secured to the feed pipe union) stands in the oil tank.
After the first 500 miles, again at 1,000 miles, and subsequently at 5,000 mile intervals,
it is recommended that the oil tank is drained, the oil filters cleaned in petrol and the
tank replenished with new oil.
For access to oil filter :—
Unscrew the hexagonal headed cap on top of oil tank and withdraw the dished washer
and spring. Then insert a finger in the felt filter and gently raise same until the
top end touches the underneath of saddle. Then by encircling the filter with the hand it
will be found possible to exert sufficient upward pressure on the flexible saddle top to
permit the filter to be completely withdrawn without distortion. Care is needed to
avoid kinking the filter.
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To re-fit filter :—
Reverse above instructions.
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NOTE—If, after the filter has been removed from the tank, it is damaged, so that the
felt is perforated, or the ends distorted, it is essential to discard it and to fit a
new filter.
Be careful to avoid damaging the filter or the cork washer under the hexagonal
cap.
For access to metal strainer (after oil has been drained from tank) :—
Remove oil feed pipe from union screwed into bottom of oil tank.
to rear wheel and is removed by unscrewing its union nut.
Spring away pipe from union.
Unscrew union from bottom of oil tank.
To re-fit metal strainer :—
Metal strainer is integral part of this union.
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Reverse above instructions.
This is pipe nearer
ADJUSTMENT OF OIL FEED
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The internal flow of oil is regulated by fixed restrictions. No adjustment is provided
except for the oil feed to the inlet valve stem. This adjustment is made by a needle
pointed screw located in the right side of cylinder head. (See Illustration 6.). It is
locked in position by a nut. The approximate correct setting is one-sixth of a complete
turn from the fully closed position. Once set it requires little, or no, adjustment.
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Inlet valve squeak indicates the oil feed adjustment is not open enough. Excessive oil
consumption, a smoky exhaust or an oiled sparking plug, generally indicates the oil
feed adjustment is open too much.
EXHAUST VALVE STEM LUBRICATION
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The exhaust valve stem is lubricated by oil fed through a passage drilled in the cylinder
head. No adjustment is provided. All excess oil is by-passed back to the timing gear
case.
LUBRICATION POINTS TO REMEMBER
A dirty, or choked, felt oil filter causes heavy oil consumption. This is because the
return flow of oil to the oil tank is slowed, or even almost completely stopped, thereby
allowing an excess of oil to " build up " in the crankcase sump, much of which passes
to the piston.
A clogged metal strainer, in the gravity feed pipe, will also cause improper, or no, oil
circulation. This can only occur as the result of adding dirty oil when replenishing the
tank.
Both end caps on pump plunger housing must be air-tight.
Check oil circulation before starting each run.
18
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Illustration 6
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The inlet valve guide is shown withdrawn as also is the inlet valve stem
adjusting screw (with lock nut)
GUIDE, FOR VALVE.
3
4 TAPPED HOLE, TO ACCOMMODATE
ROCKER BOX RETAINING BOLT.
PLAIN HOLE, TO ACCOMMODATE VALVE
GUIDE.
13 PLAIN HOLE, FOR OIL FEED TO INLET
VALVE.
6 TAPPED HOLE, TO ACCOMMODATE
CARBURETTER RETAINING STUD.
7
14 PLAIN HOLE, TO ACCOMMODATE PUSH
ROD COVER TUBE TOP GASKET.
INLET PORT.
8 TAPPED HOLE, TO ACCOMMODATE
CARBURETTER RETAINING STUD.
9
ACCOMMODATE
12 LOCK NUT, FOR NEEDLE ADJUSTING
SCREW.
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5
TO
11 NEEDLE SCREW, ADJUSTING OIL FEED
TO INLET VALVE.
CYLINDER HEAD.
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2
10 TAPPED HOLE,
NEEDLE SCREW.
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1 PLAIN HOLE, TO ACCOMMODATE CYLINDER HEAD RETAINING BOLT.
15 PLAIN HOLE, FOR OIL FEED TO EXHAUST
VALVE.
PLAIN HOLE, TO ACCOMMODATE CYLINDER HEAD RETAINING BOLT.
16 TAPPED HOLE, FOR SPARKING PLUG.
19
GEAR BOX LUBRICATION
Use one of the grades of Oils already specified. In no circumstances must heavy grease
be used.
Lubricant is inserted through the filler cap orifice mounted on top edge of kick-starter
case cover.
The gear box must not be entirely filled with oil, and, under normal conditions, the
addition of two fluid ounces of oil every 1,000 miles will be sufficient.
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Excessive oil will cause leakage.
HUB LUBRICATION
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A screwed drain plug in gear box shell, low down at rear, facilitates gear box flushing
and change of lubricant.
Keep hubs packed with grease. This prevents entry of water and dirt. Grease nipples
in centre of hubs. Inject small quantity of grease. Excessive grease may impair efficiency
of brakes.
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CHAIN LUBRICATION
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Front driving chain and dynamo chain run in oil bath. (Front chaincase.)
oil. Maintain level to height of the inspection cap opening.
Transmission harshness
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Oil in front chaincase also lubricates the engine shock absorber.
generally indicates level of oil in chaincase is too low.
Use engine
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Remove chaincase inspection cap each week, inspect level of oil, top-up as necessary.
To remove inspection cap :—
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Unscrew knurled screw about four turns.
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Slide cap sideways, till the back plate can be slipped through the opening, and take away
the complete cap assembly.
When replacing inspection cap, centralise cork washer and then fully tighten knurled
screw. Essential this is kept tight otherwise cap assembly will be lost.
Rear driving chain should be removed for lubrication. Clean chain in paraffin, drain
and wipe. Immerse in bath of molten tallow, leave for several minutes, remove and
allow excess lubricant to drain off and then replace on machine. Engine oil is a poor
substitute for tallow and, if used, chain should be allowed to soak for several hours.
Lubricate rear chain every three thousand miles in Summer and every thousand miles in
Winter.
Magneto chain runs in case packed with grease. A grease nipple is fitted to the case
cover. Inject small quantity of grease every thousand miles.
20
BRAKE EXPANDER LUBRICATION
Grease nipple on each brake expander bush. (One on each brake cover plate.)
grease sparingly. Excessive grease may impair efficiency of brakes.
Use
BRAKE ROD JOINT LUBRICATION
A few drops of engine oil on each brake rod yoke end pin and on the threaded portion
of brake rod. (One pin on yoke each end of brake rod and on bottom of foot brake cable.)
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BRAKE PEDAL LUBRICATION
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Grease nipple in heel of foot brake pedal.
SPEEDOMETER LUBRICATION
One grease nipple on top of speedometer gear box attached to right side of rear wheel
spindle- (No other part of the speedometer requires lubrication.)
STAND FIXING BOLT LUBRICATION
Several of the parts of a motor cycle that have a very small amount of movement, such
as the hinge bolts of the stands, should be lubricated.
STEERING HEAD BEARING LUBRICATION
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One grease nipple on Front Frame Head Lug and another on right hand side of Handlebar
Lug.
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CONTROL LEVER LUBRICATION
Occasionally a drop of engine oil on all moving parts of the handlebar control levers.
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If twist grip is too stiff : remove two screws binding the two halves of the clip. This
releases the grip which may be pulled off the handlebar. Smear handlebar, the drum
on which the inner wire is wound and the friction spring on the half clip with grease and
replace.
WHEN ORDERING SPARES
ALWAYS
QUOTE
THE COMPLETE ENGINE NUMBER
THIS
(Including all the Letters in it).
ENABLES
US
TO
IDENTIFY
THE
MACHINE.
EACH SERIES OF FRAMES IS NUMBERED FROM ZERO
UPWARDS. THEREFORE THE QUOTATION OF A FRAME
NUMBER ONLY DOES NOT PERMIT A MACHINE TO
BE IDENTIFIED.
21
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LUBRICATION CHART
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Illustration 7
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Lubrication Chart
Tallow Location
Engine Oil Locations
5 REAR CHAIN.
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1 MAIN OIL TANK.
7 CONTROL LEVER MOVING PARTS.
Grease Locations
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8 BRAKE ROD JOINTS.
2 FRONT HUB.
9 FRONT PROP, AND REAR STAND HINGE
PINS.
3 REAR HUB.
10 MAGNETO CHAIN CASE.
12 GEAR BOX.
11 STEERING HEAD BEARINGS.
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19 FRONT CHAIN CASE.
13 SPEEDOMETER GEAR BOX.
Hydraulic Fluid Location
16 FRONT AND REAR BRAKE EXPANDERS.
17 BRAKE PEDAL SPINDLE.
4 FRONT FORKS (Fill at Top).
When buying oils and greases it is advisable to specify the Brand as well as the grade
and, as an additional precaution, to buy only in sealed containers or from branded
cabinets.
22
MAINTENANCE
SADDLE ADJUSTMENT
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Saddle adjustment is provided at both front and rear ends. Importance is attached to
the desirability of owners selecting the adjustment most to their liking. At the front
end, the adjustment consists of three evenly spaced positions for the hinge bolt, accessible
only upon removal of the petrol tank. At the rear end, adjustment is obtained by
altering the position of the lower spring fixing nuts upon the screwed studs to which
the springs are attached.
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PERIODICAL MAINTENANCE
Regular maintenance, attention to lubrication, and certain adjustments must be made to
ensure unfailing reliability and satisfactory service. This necessary attention is detailed
below, and owners are strongly recommended to follow carefully these suggestions,
and to make a regular practice of doing so from the first.
The reference numbers, in brackets, refer to the locations specified on the Lubrication
Chart, Illustration 7.
DAILY
Inspect oil level (1) and top-up if necessary.
Petrol tank
Check level and re-fill if necessary.
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WEEKLY
Oil tank
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Check level (1) and re-fill if necessary.
Check pressures and inflate if necessary.
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Tyres
EVERY F O U R T E E N
DAYS
Clean and Top-up (see pages 79 and 80).
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Battery
Check oil circulation..
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Oil tank
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EVERY 500 MILES
Oil tank
Drain at first 500 miles and re-fill with new oil, and clean felt filter.
(1.)
Chaincase
Check level of oil when machine is standing vertically on level ground,
when level of oil should not be less than x" below bottom edge of
inspection orifice. (19.)
Rear chain
If dry, apply engine oil with a brush.
Battery
Inspect each cell for level of electrolyte and top-up with distilled water
if necessary.
23
(5.)
EVERY 1,000 MILES
Oil tank
Drain at first 1,000 miles and re-fill with new oil.
(1.)
Rear chain
Remove and soak in molten tallow in bad weather.
(5.)
Magneto chain Inject small amount of grease through nipple in magneto chain case
cover (10.)
Gear box
Add 2 fluid ounces of specified oil.
Hubs
Inject small amount of grease.
(2-3.)
Expanders
Inject small amount of grease.
(16.)
Steering head
Inject small amount of grease.
(11.)
Small parts
Smear all moving parts with engine oil and wipe off surplus.
Air Filter
(If fitted) clean and re-oil filter element.
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(12.)
EVERY 3,000 MILES
Rear chain
Remove and soak in molten tallow in Summer.
Brake pedal
Inject small amount of grease.
(5.)
Speedometer
Inject small amount of grease into speedometer gear box.
Magneto
Oil wick on contact breaker.
Smear tappet with thin oil.
Clean contact breaker points and re-set if necessary.
Plug
Clean sparking plug and re-set points if necessary.
Steering head
Test steering head for up and down movement and adjust if necessary.
Bolts and nuts
Check all nuts and bolts for tightness and tighten if necessary, but
beware of over-tightening.
Rockers
Check O.H.V. rocker adjustment and correct if necessary.
(17.)
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(13.)
EVERY 5,000 MILES
Clean metal mesh filter in oil tank.
Clean felt fabric filter in oil tank.
(Illustration 4.)
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Filters
Drain and re-fill with new oil. (1.) If machine is only used for short
runs renew oil every three months instead of mileage interval.
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Oil tank
Clean as detailed in Electrical section.
Dynamo
Clean as detailed in Electrical section.
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Magneto
Front fork
Check each side of front fork for hydraulic fluid content and, if
necessary, top up. (4.)
Rear legs
(If fitted) check each leg for hydraulic fluid content and, if necessary,
top-up. (1-13.)
Carburetter
Remove carburetter float chamber and clean its interior.
EVERY 10,000 MILES
Magneto and
Dynamo
Get a Lucas Service Station to dismantle, clean, lubricate and
generally service.
A i r Filter
(If fitted) renew filter element.
24
FREE SERVICE SCHEME
FREE SERVICE SCHEME
All owners of N E W MODELS are entitled to one FREE SERVICE A N D
INSPECTION at 500 miles, or, at latest, three months after taking delivery.
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This service is arranged by the supplying dealer to whom the Free Service Voucher
must be handed. This voucher, together with the Instruction Manual, are supplied
by us upon receipt of the signed application card to be found in the tool box upon taking
delivery of a new motor cycle.
The INSPECTION A N D SERVICE consists of :
(a) Check, and, if necessary, adjust :
(1) Rocker clearances.
(2) Contact breaker points.
(6) Wheel bearings.
(7) Brakes.
(8) Forks, legs, and steering head.
(3) Sparking plugs.
(9) Alignment of wheels.
(4) Clutch.
(10) Tyre pressures.
(5) Chains.
(b) Tighten all external nuts and bolts, including cylinder bolts.
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(c) Top-up battery and check all lighting equipment.
(d) Clean out carburetter and adjust mixture.
(f) Grease all nipples.
Clean filter and replenish.
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(g) Drain oil system.
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(e) Adjust and lubricate all cables.
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(h) Check oil level in front chaincase.
(i) Top-up gear box.
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(j) Test machine on the road.
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NOTE—Oils, greases and materials used are chargeable to the customer.
FOR THE
CONVENIENCE
SPARES
OF
OWNERS,
STOCKISTS
ARE APPOINTED FOR MOST DISTRICTS. TO
SAVE DELAY, AND THE DELIVERY SURCHARGE,
CUSTOMERS ARE RECOMMENDED TO ALWAYS
APPLY TO THEIR NEAREST SPARES STOCKIST.
25
D—A
ENGINE SERVICE
ACCESS
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For almost all service work to the upper parts of the engine, it is necessary, in order to
obtain accessibility, first, to remove the petrol tank. The two petrol taps facilitate
this operation by removing the need to first drain the tank of petrol.
Illustration 8
Showing details and order of assembly, of the fuel tank fixing bolts and
components
Part Number
A
B
C
D
E
…
…
…
…
…
…
014999
1¼" diameter.
PAD …
…
…
…
…
…
014995
s" high.
…
…
…
…
…
…
BOLT …
…
…
…
…
…
014996
014997
x" high.
1¼" x c" x 26.
SLEEVE FOR FIXING BOLT …
…
…
…
…
014998
m" l o n g .
…
…
…
METAL WASHER
…
…
T A N K FIXING
THICK RUBBER
T HI N RUBBER PAD
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TO REMOVE THE PETROL TANK
Close both petrol taps and disconnect the petrol feed pipe from each tap. (Use two
spanners, one to hold the tap and the other to unscrew the union nut on the petrol pipe.)
Cut the wires interlacing the four fixing bolts.
Unscrew the tank fixing bolts and the tank is then free to be taken away.
TO REPLACE THE PETROL TANK
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NOTE—The disposition of the various rubber and metal washers and tubular spacers
should be specially observed so that they may be correctly replaced.
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Proceed in reverse order to removal. Screw firmly home the four fixing bolts and
interlace them, in pairs, with 22 gauge copper wire.
TO REMOVE THE ROCKER BOX
Remove the petrol tank.
Remove the three nuts and fibre washers retaining the rocker box side cover and take
away the cover.
Disconnect the oil pipe feeding oil to the rocker box.
Turn over engine until both valves are completely closed.
On 500 c.c. model, remove engine steady bracket by removing bolt from frame clip and
nuts and washers from the rocker box bolt extensions.
Disconnect valve lifter cable.
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Remove the nine bolts retaining rocker box to cylinder head.
Lay
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Tilt upward the right hand side of rocker box and extract the two long pushrods.
these aside so they may be identified and replaced in their original position.
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The rocker box may then be lifted off.
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TO REPLACE THE ROCKER BOX
Carefully clean the top of cylinder head and lower face of rocker box.
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Revolve engine until both tappets are down, i.e., the top dead centre of firing stroke.
Lay the composition jointing washer on cylinder head. This must be faultless. If
necessary, renew.
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Lay the rocker box in position then slightly raise the right hand side to allow the long
push rods to be inserted into their original respective positions.
Insert all nine rocker box fixing bolts and note that the bolt with short head is in the
centre right hand position and on 500 c.c. models the bolts with threaded extensions
are fitted one each side of the central short head bolt.
Tighten each bolt in turn bit by bit until all are fully home.
On 500 c.c. models replace the engine steady stay.
Turn engine over several times to ensure parts have bedded home.
Re-fix valve lifter cable.
Re-fix rocker box oil pipe union nut using two spanners to ensure that the union
screwed into rocker box does not turn while the nut is being tightened.
Check tappet clearances and re-set if necessary.
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Inspect rubber fillet on rocker box side cover and renew if not perfect.
Replace the side cover ensuring that a fibre washer is fitted under each of the three
retaining nuts.
Beware of over tightening these nuts, the joint being made by the rubber fillet
excessive pressure is not necessary.
Replace the petrol tank.
DECARBONISATION
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Instead of the usual stipulated mileage interval between periods of decarbonisation, it is
recommended that this is undertaken only when the need for same becomes apparent
because of excessive pinking, loss of power or generally reduced performance. When
undertaken, unless it is thought necessary to inspect the piston and rings, the cylinder
barrel is best left undisturbed. The various stages in decarbonisation are described
below.
TO REMOVE THE CYLINDER HEAD
Remove
The petrol tank.
The sparking plug.
The rocker box.
Remove the exhaust system by :
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Remove nut, and washers, retaining exhaust pipe to its stay.
Remove nut, and washers, retaining silencer to its stay.
Remove complete exhaust system, by pulling away from stays and then downwards,
from the exhaust port in cylinder head.
Remove carburetter by :
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Remove
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Unscrew two carburetter retaining nuts.
Take away carburetter and rest on saddle.
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The four bolts retaining cylinder head to barrel, and head is free to be taken away.
While doing this the push rod cover tubes will come away with the head.
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If the sparking plug or cylinder head bolts resist removal, do not use force but brush
paraffin round their heads and leave for a time to soak before making further effort.
TO REMOVE A N D REPLACE THE VALVES
Remove the cylinder head.
Attach the special valve spring compressing tool, Part No. 014605, to cylinder head with
the two bolts provided (Part No. 010795), see illustration 9. Then compress
the springs by screwing in evenly the two long bolts, the reduced tips of which will
engage with the countersunk depressions on the valve spring collar. The split collet can
then be withdrawn leaving the valve free. To remove the compressor slacken each of
the long bolts little by little in turn until they are clear of the valve spring top cap.
After removing the compressor tool the whole spring assembly can be lifted off. To
ensure accurate replacement it will be observed that the valve spring block to which the
prong ends of the hairpin valve springs are attached, is provided with a dowel pin which
engages a hole in the valve guide boss.
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To replace valves :—
After cleaning valve guide bores with
rag smear each valve stem with clean
oil and reverse procedure above.
I M P O R T A N T N O T E :—
Illustration 9
Showing application of
valve spring compressor
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If for any reason valve springs are removed from their fixing block it is
important to see that upon replacement the spring with narrow spaced
prongs is entered into the block from
the chamfered end.
5
1 INLET VALVE PORT.
BOLTS, IMPINGING O N V A L V E S P R I N G
C O L L A R W H I C H , UPON BEING SCREWED
2 ORIFICE FOR SCREW ADJUSTING OIL FEED
TO INLET VALVE.
ROCKER
BOX
BY PERMITTING ITS REMOVAL.
6
TO
BODY OF V A L V E S P R I N G C O M P R E S S O R .
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3 OIL PASSAGE FROM
INLET VALVE GUIDE.
D O W N , EXPOSE V A L V E C O L L E T THERE-
7
COLLAR, RETAINING VALVE SPRINGS.
8
VALVE SPRINGS.
9
ORIFICE FOR VALVE GUIDE.
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4 BOLTS, 010795 RETAINING V A L V E S P R I N G
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C O M P R E S S O R TO CYLINDER HEAD.
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NOTE—The special valve spring compressor tool is not part of the standard tool kit but is
obtained from any of our dealers complete with bolts for attachment (Part
No. 014605.)
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It is essential that the collets are correctly located on the valve stems. It will
be observed that the collet has two grooves machined in the bore and those
two grooves must register with the two rings on the valve stem. If fitted so that
only one of the grooves engages the ringed valve stem, damage will almost certainly
result.
On 350 c.c. the inlet valve head is larger in diameter than the exhaust. Therefore
inlet and exhaust valves are not interchangeable and no mistake can be made
when replacing same in the cylinder head.
On 500 c.c. both valve heads are identical in dimensions but are made of different
materials. Therefore, upon removal, valves should be laid aside so that they
may be identified for re-fitting. In case of doubt, see marking " In " or " Ex "
on top of stem above collet grooves.
SPARES LIST
IS T H E APPROPRIATE
EDITION CL-18 PRICE
LIST FOR THIS
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SERVICE
2/6
MANUAL
REMOVING CARBON DEPOSIT
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Do not use a sharp implement for removing carbon deposit from the interior of the
cylinder head and the piston crown. A blunt piece of soft brass will be found quite
suitable and the use of such will obviate the risk of making deep scratches. Care is
necessary to avoid damaging the valve seatings and in no circumstances should any
abrasive material, such as emery, or emery cloth, be used for cleaning and polishing.
Illustration 10
Showing flywheel in exploded form
VALVE GRINDING
Before commencing valve grinding, carefully examine the face of each valve and, if any
are found to be deeply pitted, have them refaced. (Most garages have suitable equipment
for that purpose.) Any attempt to remove deep pit marks by grinding will inevitably
cause undue and undesirable widening of the seats.
As a rule, inlet valves require very little attention and one light application of fine grinding
paste should be sufficient to restore an even matt finish to both valve face and seat.
The exhaust valves may require two, or even three, applications but, as already mentioned,
excessive grinding is both unnecessary and harmful.
30
The grinding is accomplished by smearing a thin layer of fine grinding paste (obtainable
ready for use at any garage) on the valve face and then, after inserting the valve in the head,
partially revolve, forwards and backwards, while applying light finger pressure to the head,
raising the valve off its seat and turning to another position after every few movements.
(Never revolve the valve continuously in one direction.)
When the abrasive ceases to bite, remove the valve and examine its face.
The grinding may be considered to be satisfactorily completed when a continuous matt
ring is observed on both valve face and seat.
After grinding, all traces of abrasive must be carefully washed off with petrol and a piece
of rag, moistened in petrol, should be pulled through the bore of each valve guide to
remove any abrasive that may have entered.
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TO REPLACE THE CYLINDER HEAD
The part number
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A holder for the valve, when grinding in the valve, can be supplied.
is 017482.
A gasket is fitted between cylinder head and barrel. (Touring models only).
The top ends of the push rod cover tubes have rubber gaskets between tubes and head,
they are a push fit and metal washers are located between the top edges of the gaskets
and the cylinder head recesses. If the cover tubes are pulled away from the head, the
gaskets will probably remain in position in the head.
It should be noted that a compression plate is a standard fitment on all 500 c.c. machines.
A rubber gland is fitted at the bottom of each cover tube.
Replace the cylinder head by :
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Carefully clean the top edge of the cylinder barrel and the under face of the cylinder
head.
Fit the cover tubes, with their rubber gaskets and metal washers, into the cylinder
head.
Place the cylinder head gasket in position on the top edge of the cylinder barrel.
Place a rubber gland round each tappet guide.
Place the cylinder head in position.
Ensure each cylinder head securing bolt has a plain steel washer on it and then replace
the bolts and engage each a few turns.
Finally, screw down the cylinder head securing bolts, in turn, bit by bit, till all are fully
home.
Replace
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The sparking plug, but before doing so it is desirable to coat thread with " O i l Dag" or
graphite paste to prevent seizure upon next removal.
The rocker box, carburetter, exhaust system, and the petrol tank.
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NOTE—If old gaskets are re-fitted they must be in an undamaged state otherwise new
must be used.
TO REMOVE THE CYLINDER BARREL A N D PlSTON
Remove
The cylinder head.
The four nuts retaining cylinder barrel to crankcase.
Take away
Cylinder barrel. (Ensure piston is not damaged in doing this.
as barrel is withdrawn.)
Steady piston with hand
Fill throat of crankcase with clean rag to prevent entry of foreign matter,
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Remove
One gudgeon pin circlip.
included in tool kit.
It is immaterial which circlip is removed.
Use special pliers
Gudgeon pin by pushing it out of piston.
Take away piston.
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NOTE—The gudgeon is an easy sliding fit in both piston and connecting rod small-end
bush.
Rings may be removed from a piston by " peeling o f f " with a knife, or by
introducing behind the rings three pieces of thin steel spaced at 120° from each
other and then sliding off the rings. (Do not scratch the piston.)
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TO REPLACE THE PlSTON A N D CYLINDER BARREL
All parts must be clean.
Place rings on piston. (Scraper first then the two compression.) (On 500 c.c. models the
top compression ring is chromium plated and is marked on one edge " top " for refitting.)
Smear gudgeon pin with engine oil.
Refit piston by :
Introduce piston over connecting rod, so that slit in piston faces to the front of the
machine.
Introduce gudgeon pin in piston and pass it through connecting rod small-end bush and
centralise it.
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Re-fit circlips. (Use special pliers). Use rotary action when bedding circlips in their
grooves and make sure each circlip lies snugly in its groove. This is essential otherwise
considerable damage will result.
Re-fit cylinder barrel by :
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Take new cylinder base washer. Coat one side with liquid jointing compound and
apply it to cylinder base. Ensure jointing does not choke any of the cylinder base oil
holes.
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Smear cylinder bore and piston with engine oil.
Space piston rings so that the gaps are evenly spaced at 120° to each other.
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Remove rag from crankcase throat.
Fit barrel over piston. Ensure each piston ring is fully compressed into its groove,
in turn, as the barrel passes over it.
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Replace cylinder barrel holding down nuts, screwing each down, in turn, bit by bit, till
all are fully home.
CAM CONTOUR
On the flanks of the cams are quietening curves which are very slight inclines from the
base circles to the feet of the humps.
Therefore, it is necessary to ensure the tappet ends are on the base circles when checking
valve clearances and valve timing.
It is for this reason valve clearances must be checked when the piston is at the top of its
compression stroke, at which position both tappets are well clear of the quietening
curves.
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VALVE TIMING
Inlet valve timing
Inlet valve opens 32° before top dead centre.
Inlet valve closes 63° after bottom dead centre.
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Exhaust valve timing
Exhaust valve opens 65° before bottom dead centre.
Exhaust valve closes 30° after top dead centre.
(See page 92 for particulars of special timing disc graduated in degrees.)
Illustration 11
Inlet Camshaft timing marks
(Use mark " 2 " )
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When checking the valve timing the tappet clearances must be set to ·016 inch so that
the tappets may be well clear of the quietening curves of the camshafts.
The timing gears are marked to facilitate their replacement.
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To re-set the valve timing, by using the marks on the gears, proceed as
follows :—
Turn over the engine till the mark on the small timing pinion (D in Illustration 11) is
in line with the centre of the inlet (rear) camshaft bush. Insert the inlet camshaft so
that the No. 2 mark on it is in mesh with the mark on the small timing pinion (D).
Rotate the engine in a forward direction till the mark on the small timing pinion (D
in Illustration 12) is in line with the centre of the exhaust (front) camshaft bush. Insert
the exhaust camshaft so that the No. 2 mark on it is in mesh with the mark on the small
timing pinion (D).
Illustration 12
Exhaust Camshaft timing
marks
(Use mark " 2 " )
33
E—A
TAPPET ADJUSTMENT
The top ends of the two long push rods have screwed extensions.
position by nuts, thereby providing tappet adjustment.
These are locked in
The correct tappet clearances, on touring models, with valves closed and engine cold,
is N I L (warm engine on competition models). This means the push rods should be free
enough to revolve and, at the same time, there should be no appreciable up and down
play.
Prepare to adjust tappets by :
Set piston to T.D.C.
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Remove the three nuts, and fibre washers under them, retaining tappet cover to rocker
box.
Take away cover.
Adjust tappets on all 350 and 500 models by :
With spanners, hold the sleeve C, either valve (Illustration 13) and slacken lock nut B.
Then screw, in or out, the head A until the clearance is nil.
Tighten lock nut B and re-check the clearance.
Treat other valve in like manner.
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Illustration 13
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Tappet adjustment
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Finally
Check adjustments so that, with no up and down movement, the long push rods are free
to revolve when the valves are closed.
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Complete adjustment by :
Replace rocker tappet cover taking care to replace the fibre washer that is under each
retaining nut.
Do not over-tighten the nuts because the joint is made with a rubber fillet and undue
pressure is not necessary.
NOTE—In normal conditions tappet adjustment should not be necessary more frequently
than about every five thousand miles or after decarbonising and grinding valves.
If adjustment is found necessary more frequently the cause should be investigated
at once.
The tappet rods are made of Light Alloy, and in manufacture, the sleeve marked C in
illustration 13 is fitted to the bare rod and then the push sleeve and the rod are threaded
to take the adjusting screw marked A.
It will consequently be seen that, contrary to the practice when steel rods are used, it
is not possible to supply and fit sleeve C to an existing Light Alloy rod.
Consequently for 1951 models, the " Push Rod, bare " will only be supplied for spares
purposes complete with sleeve C already fitted and threaded.
34
TO RE-TIME THE IGNITION
The maximum advance is ½" (39°).
Have available a stout screwdriver, or an old type tyre lever with turned up end, and a
piece of stout wire 5½" long.
Before setting the ignition firing point it is essential the magneto contact breaker points
are correctly adjusted. Therefore always check these first.
Check contact breaker points by :
Remove contact breaker cover.
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Check setting of contact breaker points, and, if necessary, re-set same.
(Causing
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Serious damage may result from the ignition being set too far advanced.
detonation).
Set ignition firing point by :
Remove :—
The sparking plug high tension cable from plug.
The sparking plug.
The magneto chain case cover.
The rocker box tappet cover.
Unscrew, several turns, nut retaining magneto sprocket to camshaft.
nut).
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Lever off sprocket until it is loose on the taper of the shaft.
or old type tyre lever.)
(No need to remove
(Use stout screw-driver
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Turn over engine till both valves are closed.
Insert rod through sparking plug hole, feel piston, by rocking engine forwards or
backwards till it is felt the piston is at the top of its stroke.
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Mark rod flush with top face of sparking plug hole.
the flush mark and record position on rod.
Remove rod and measure ½" above
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Place handlebar ignition control lever in fully advanced position.
Replace rod in sparking plug hole.
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Slightly rotate engine BACKWARDS until upper mark on rod is flush with top face
of sparking plug hole. (To rotate engine, engage top gear and turn back wheel by hand.)
Rotate sprocket on magneto armature shaft, in anti-clockwise direction (as seen from
sprocket end of magneto), till the contact breaker points are just about to separate.
(To find the exact moment for the commencement of the point separation, place a piece
of tissue paper between the points and turn the armature shaft (by the sprocket on it)
until the paper is just released, and no more, upon a gentle pull.)
Tighten nut on camshaft and ensure engine, and/or magneto shaft, does not move in
doing so.
Re-check the setting which must be ½" before top dead centre.
handlebar control lever in the fully advanced position.)
(With the ignition
See page 92 for particulars of special timing disc graduated in degrees.
Replace
Rocker box tappet cover, Contact breaker cover, Magneto chain case cover, Sparking
plug (see note on page 37 re graphite on sparking plug thread), and Sparking plug wire.
35
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Illustration 14
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The rotating oil pump plunger is here shown partially withdrawn, together with the guide screw which registers in the
plunger profiled groove, thereby providing the reciprocating movement
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(By courtesy of " Motor Cycling ")
D O W E L PEG, LOCATING TIMING GEAR
COVER.
BUSH, FOR INLET CAMSHAFT.
3
PLUNGER, FOR OIL PUMP.
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9
BOLT, FIXING REAR END CAP.
BOLT, FIXING REAR END CAP.
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4
5
TAPPED
HOLE,
TO
ACCOMMODATE
CRANKCASE DRAIN PLUG.
CRANKCASE, TIMING SIDE.
11 GUIDE SCREW A N D PIN, FOR OIL PUMP
PLUNGER.
6
REAR END CAP, FOR OIL PUMP.
12
PLUG SCREW, FOR OIL PASSAGE.
7
TAPPED HOLE, FOR
OIL TO OIL T A N K .
RETURNING
13
PLUG SCREW, FOR OIL PASSAGE.
TAPPED HOLE, FOR PIPE FEEDING OIL TO
OIL PUMP.
14
BUSH,
AXLE.
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PIPE
FOR
TIMING
SIDE
FLYWHEEL
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TO REMOVE A N D REPLACE THE OIL PUMP PLUNGER
Remove
Lower end of rocker box oil feed pipe by unscrewing union nut.
Both oil pump end caps.
Oil pump plunger guide screw with pin.
(See illustration 14, No. 11.)
Oil pump plunger, by pushing at front and extracting from rear end of its housing.
Replace by :
Reversing above procedure.
36
NOTE—Remember there is a paper washer under each oil pump end cap and, when
fitting a new paper washer to the front cap, ensure the oil passage in the
front cap is not obstructed by the paper washer.
Make certain that the guide screw pin is correctly located in its groove (cut in
the plunger) before tightening down otherwise serious damage will result when
the engine is revolved. NOTE :—The guide screw pin is inserted in the screw
relieved end first.
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OVERSIZE PARTS AND RE-BORING CYLINDER BARREL
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Pistons and rings, .020" and .040" larger than standard, are available. These degrees
of oversize make it essential for the cylinder barrel to be re-bored to accommodate them.
We can provide that service at prices quoted in the Spares List.
On the 350 c.c. the cylinder standard bore is 2.7187 ± .0005".
standard bore is 3.250 ± .0005".
The 500 c.c. cylinder
When the wear at the top of the barrel reaches .008" the barrel should be bored out
.020" oversize and a new oversize piston and rings fitted.
Crankpin rollers .001" larger than standard can be supplied. We recommend only
skilled mechanics should fit these because it is almost general that the big-end journals
and sleeves require " lapping " to ensure a correct fit.
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REMOVE SPARKING PLUG
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Always exercise the greatest care to avoid thread seizure when removing a sparking
plug. If any resistance is felt, apply paraffin. Before replacing plug, it is desirable to
coat the thread with " O i l Dag" or Graphite paste. This will guard against seizure
upon subsequent removal.
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PUSH ROD COVER TUBES
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350 machines are normally not fitted with a compression plate. In that circumstance,
on each push rod cover tube there is one 011087 metal washer, 3/64" thick. This is
located BELOW the rubber top gasket. Also a similar washer is fitted on the top of the
rubber top gasket.
The compression plate 014839 can be fitted to the Competition 350 engines. This plate
is z” in thickness and this then reduces t h e compression rati o f r o m 6·35 to 1 to 5·88
to 1, and when such a plate is fitted there is an additional 011087 metal washer fitted
on the top of the rubber top gasket, making a total of two in that location on each
cover tube.
All 500 c.c. engines are fitted with a compression plate which is 8" in thickness, and
each push rod cover tube then has one 011087 metal washer, 3/64" thick, located below
the rubber top gasket and one 014603 metal washer, 8" thick, located over the rubber
top gasket.
If, for any reason, the compression plate is dispensed with (increasing the compression
ratio from 6·00 to 1 to 7·24 to 1) the 014603 washer on the top of each rubber top gasket
is replaced with one 011087 metal washer, 3/64" in thickness.
37
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Illustration 15
Showing the mixing chamber with details of the pilot jet
with its air adjusting screw and the throttle stop screw
38
CARBURETTER SERVICE
The information given in this section includes all that will normally be required by the
average rider. For further details, particularly those connected with racing and the use
of special fuels, we refer the enquirer to the manufacturers of the carburetter, Messrs.
Amal Ltd., Holford Works, Perry Barr, Birmingham.
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Our Spare Parts Department does not stock every part of the carburetter but confines
its stock to those parts that, from time to time, may need replacement as the result
of wear. Those parts include floats and float needles, jet taper needles, needle jets and
washers.
CARBURETTER FUNCTION
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The petrol level is maintained by a float and needle valve and, in no circumstances,
should any alteration be made to this. In the event of a leaky float, or a worn needle
valve, the part should be replaced with new. (Do not attempt to grind a needle to its
seat.)
The petrol supply to the engine is controlled, firstly, by the main jet and, secondly, by
means of a taper needle (see 6, Illustration 15) which is attached to the throttle valve and
operates in a tubular extension of the main jet.
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The main jet controls the mixture from three-quarters to full throttle, the adjustable
taper needle from three-quarters down to one-quarter throttle, the cut-away portion
of the intake side of the throttle valve from one-quarter down to about one-eighth
throttle, and a pilot jet, having an independently adjusted air supply, takes care of the
idling from one-eighth throttle down to the almost closed position. These various stages
of control must be kept in mind when any adjustment is contemplated. (See 18, Illustration 15, for location of the pilot jet air adjustment screw.)
The pilot jet consists
of a small hole drilled in the choke, or jet block.
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The size of the main jet should not be altered save for some very good reason. See
" DATA " for details of standard sizes of jet, throttle valve, and jet taper needle.
With the standard setting it is possible to use nearly full air in all conditions, except,
perhaps, when the engine is pulling hard up hill or is on full throttle, when some benefit
may be obtained by slightly closing the air control.
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Weak mixture is always indicated by popping, or spitting, at the air intake.
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A rich mixture usually causes bumpy, or jerky, running and, in cases of extreme richness,
is accompanied by the emission of black smoke from the exhaust.
See Illustration 15
SPRING CLIP, LOCKING THE FIXING RING.
2
CABLE ADJUSTER, FOR BODY TOP.
3
SCREW, SECURING
BODY TOP.
4
TOP, FOR MIXING BODY.
RING, FIXING TOP TO MIXING BODY.
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1
5
LOCKING
12 FIBRE WASHER, FOR HOLDING BOLT.
CLIP TO
6
TAPER NEEDLE, FOR NEEDLE JET (TOP
NOTCHED END S H O W N ) .
7
MIXING BODY.
8
CLIP, LOCATING JET TAPER NEEDLE.
AIR BALANCE PASSAGE.
9
11 THREADED HOLE, TO ACCOMMODAT E
PILOT JET AIR ADJUSTING SCREW (18).
13 PART OF FLOAT CHAMBER.
14 BOLT, HOLDIN G FLOAT CHAMBER TO
MIXING BODY.
15 PLUG SCREW, FOR PETROL PASSAGE IN
FLOAT CHAMBER.
16 U N I O N NUT , FOR MIXING BODY BASE.
17 LOCK NUT , FOR PILOT JET AIR SCREW.
18 SCREW, FOR PILOT JET AIR ADJUSTMENT,
10 PASSAGE TO A L L O W MIXTURE FROM
THE PILOT JET MIXING CHAMBER TO
PASS TO THE CARBURETTER MA I N BORE
A N D THENCE TO THE INLET PORT OF
THE ENGINE.
19 STOP SCREW, FOR THROTTLE.
20 LOCK NUT , FOR THROTTLE STOP SCREW.
21 RING, FIXING TOP TO MIXING BODY.
39
CARBURETTER ADJUSTMENT
To ascertain if the setting is correct, a rough test Is to warm up the engine and, with the
ignition fully retarded and the air about three-quarters open, gradually open the throttle
to full open, during which the engine should respond without a misfire, but, upon a
sudden opening of the throttle, it should splutter and stop. (The engine should not be
run for more than a few seconds with the ignition fully retarded.)
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To check the setting of the pilot jet and its air control, warm up the engine, then, with
the ignition about two-thirds advanced and the air about three-quarters open, the engine
should idle positively and evenly when the throttle is almost closed. If it fails to do so,
adjust the pilot jet air screw (18, Illustration 15) inwards, or outwards, until even firing
is obtained. (The pilot jet air screw is at the base of the mixing chamber and its position
is locked by a nut. See 17 and 18, illustration 15.) This adjustment is not unduly
sensitive, and it should be possible to obtain the correct adjustment in a few seconds.
In the event of the adjustment of the air screw failing to provide the required result it
is possible the pilot jet is obstructed with dirt. The pilot jet is actually a passage drilled
in the sprayer base, or choke, and is very small, so there is always latent danger of this
becoming choked.
Upon removing the float chamber and the large nut at the bottom of the mixing chamber,
the sprayer base can be pushed out of the mixing chamber and the jet can be cleared by
using a strand of fine wire.
Before concluding that incorrect carburation is responsible for heavy petrol consumption,
and before carrying out any of the tests and adjustments described above, it is most
important to make sure the ignition is set correctly. Late ignition usually causes a
great increase in petrol consumption.
T W I S T GRIP ADJUSTMENT
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A screw is provided in one of the halves of the twist grip body to regulate the spring
tension on the grip rotating sleeve. This screw, which is locked by a nut, must be screwed
into the body to increase the tension.
The most desirable state of adjustment is that when the grip is quite free and easy to
operate but, at the same time, will stay in the position in which it is placed.
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The complete twist grip can be moved on the handlebar by slackening the two screws
that clamp together the two halves of the body. The most desirable position is that in
which the throttle cable makes the cleanest and most straight path to the under-side
of the petrol tank.
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During assembly, all control inner cables are coated with a graphite lubricant. This lasts
practically indefinitely, but should a new inner wire be fitted this must be similarly
treated during assembly.
AIR FILTER
In locations, such as the United Kingdom, where the roads and atmosphere are
particularly free from dust, it is not considered necessary to have an air filter fitted to
the carburetter, but in countries where the atmosphere contains a very heavy dust
content, an air filter is essential in order to prevent abrasive wear.
The filter we supply as standard for the conditions mentioned above is of the " O i l
Wetted " type, and this requires periodical servicing.
When servicing the air filter, withdraw the filter element. Thoroughly wash this in
petrol, paraffin on other suitable solvent and allow to dry. Then re-oil, using one of the
light oils (SAE-20), enumerated in the final table on page 15, and allow to drain before
replacing in the filter case. Clean regularly at intervals of 1,000 miles and renew the
element every 10,000 miles.
40
CARBURETTER T U N I N G INFORMATION
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Poor idling may be due to :
Air leaks. Either at junction of carburetter and inlet port, or by reason of badly worn
inlet valve stems or guides.
Faulty engine valve seatings.
Sparking plug faulty, or its points set too closely.
Ignition advanced too much.
Contact breaker points dirty, pitted, loose, or set too closely.
High-tension wire defective.
Pilot jet not operating correctly.
Rockers adjusted too closely.
Heavy petrol consumption may be due to :
(Test
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Late ignition setting.
Bad air leaks. Probably at carburetter joint.
Weakened valve springs.
Leaky float. (Causing flooding.)
Taper needle extension insufficient.
Poor compression, due to worn piston rings or defective valve seatings.
compression with throttle wide open.)
Illustration 16
The Transmission of power, or drive, through the gears may easily be
traced on above illustration.
F—A
41
TRANSMISSION
SERVICE
THE GEAR BOX
The gear box provides four speeds and has a positive foot change, operated by the right
foot, and a kick-starter.
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It is retained to the frame by being clamped between the two engine rear plates by two
bolts. The bottom fixing bolt acts as a pivot. The top fixing bolt passes through the
gear box top lug and the rear plates, which are slotted, thereby allowing a swinging fore
and aft movement of the gear box to enable the front driving chain to be adjusted. That
movement is controlled by a bolt that has an eye encircling the gear box top fixing bolt
and which passes through an eye block secured to the right-hand side engine rear plate.
Two nuts threaded on the eye bolt, one on each side of the eye block, provide means of
accurately tensioning the front chain and, after that adjustment, locking the eye bolt
in its required position.
The Spring Frame Competition machines are fitted with the B.A. type gear boxes.
These vary in detail (principally in respect to dimensions), from the gear boxes fitted to
all the other models, but the transmission of power through the gears and all the other
information given in this section is equally applicable.
TRANSMISSION OF POWER THROUGH THE GEARS
(See Illustration 16.)
First, or lowest, gear
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Sliding gear (C) on mainshaft (T) is in mid-way position, i.e., disengaged from gears
B and D.
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Layshaft sliding clutch (W) moves to right and engages with gear (G). Power passes
through clutch A, to mainshaft T, to mainshaft sliding gear C, to layshaft gear G, to
layshaft clutch V, to layshaft gear E, to main gear B, to chain sprocket J.
Second gear
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Sliding gear (C), on mainshaft, is in mid-way position, i.e., disengaged from gears B and D.
Layshaft sliding clutch (W) moves to left and engages with gear (F).
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Power passes through clutch A, to mainshaft T, to mainshaft sliding gear C, to layshaft
gear F, to layshaft clutch W, to layshaft V, to layshaft gear E, to main gear B, to chain
sprocket J.
Third gear
Sliding clutch (W), on layshaft, is in mid-way position, i.e., disengaged from gears F and G.
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Mainshaft sliding gear (C) moves to right and engages with gear D.
Power passes through clutch A, to mainshaft T, to mainshaft sliding gear C, to mainshaft
gear D, to layshaft gear H, to layshaft V, to layshaft gear E, to main gear B, to chain
sprocket J.
Fourth, or top gear
Sliding clutch (W), on layshaft, is in mid-way position, i.e., disengaged from gears F and G.
Mainshaft sliding gear (C) moves to left and engages with main gear B.
Power passes through clutch A, to mainshaft T, to mainshaft sliding gear C, to main gear B,
to chain sprocket J.
NOTE—Clutch A is connected to the engine sprocket by the front driving chain and chain
sprocket J is connected to the rear wheel by the rear driving chain.
42
TO REMOVE FRONT CHAINCASE AND CLUTCH ASSEMBLY
To remove outer half of front chaincase
Place tray under chaincase to catch oil.
Remove exhaust pipe and silencer, as one unit.
Remove nut on left end of footrest rod, push rod towards the right hand side of machine
sufficiently to allow footrest for left foot to be disengaged.
Slide footrest arm to one side or completely take away.
Remove metal band.
Remove rubber band.
Take away outer half of chaincase.
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Remove nut and washer, in centre of chaincase front.
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Remove screw binding chaincase metal band at its rear.
To remove front driving chain and clutch assembly
Engage top gear, apply rear brake, and unscrew engine sprocket nut.
Unscrew the nuts retaining the clutch springs.
Take away the clutch spring pressure plate with the clutch springs and clutch spring cups,
and flatten the turned up part of the lock washer that is under the large central nut.
Remove front chain connecting link and take away chain.
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Engage top gear, apply rear brake, and unscrew nut retaining the clutch centre to the
gear box mainshaft.
Remove the lock and plain washers from gear box mainshaft.
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Remove complete clutch assembly by pulling it away, as one unit from gear box mainshaft.
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Take care not to lose any of the twenty-four clutch sprocket bearing rollers which may
be displaced when the clutch centre and sprocket assembly is withdrawn from the mainshaft. The clutch centre is a sliding fit on the mainshaft and an extractor should not be
required.
To remove dynamo chain and back half of chaincase
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Remove the spring lock ring on dynamo sprocket retaining nut.
Take away lock washer surrounding dynamo sprocket nut.
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Apply spanner (017254, included in tool kit) to the two flats on the back of the dynamo
sprocket and, holding same, unscrew the nut retaining the dynamo sprocket.
Release dynamo sprocket with suitable extractor.
Take away, as one assembly, the dynamo sprocket, dynamo chain and engine shock
absorber assembly. (The dynamo chain is " endless.")
Straighten tabs on lock washers under the three bolts retaining the back half of chaincase
to the boss on the crankcase and remove the three bolts.
Remove the long headed bolt (under battery carrier) fixing rear chain guard to front
chaincase.
Remove nut on centre fixing bolt, and spacer behind it, and back half of chaincase can be
taken away.
43
TO RE-FIT THE FRONT CHAINCASE AND CLUTCH
Fit back half of front chaincase by :
Place on face of crankcase boss and back face of chaincase some liquid jointing compound.
Ensure the spacer is in position on the centre fixing bolt.
the engine plate and the chaincase. (It is 1-13/32" long.)
This is located between
Place in position rear half of front chaincase.
Fit long headed bolt, holding rear chain guard to front chaincase, but do not fully tighten.
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Fit to crankcase boss the three lock washers and bolts retaining case to boss.
Fully tighten the three bolts and turn up the tabs of the three lock washers.
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Fit spacer (inside chaincase, d" long) to the centre fixing bolt.
Fit nut to centre fixing bolt and fully tighten.
Fully tighten long headed bolt holding rear chain guard to front chaincase.
Fit dynamo sprocket and chain and engine shock absorber by :
Ensure dynamo sprocket key is in position (in dynamo armature shaft.)
Ensure the spacing collar, which fits between crankcase ball bearing and the back of the
engine sprocket, is in position on the driving side flywheel axle.
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Take dynamo driving chain and place it round the small sprocket of the engine sprocket
assembly and the sprocket that fits on the dynamo shaft and fit these three parts, in one
movement, to the driving side flywheel axle and the dynamo shaft.
Fit the dynamo shaft plain washer and sprocket retaining nut, screwing nut with fingers
only.
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Hold the dynamo sprocket by applying spanner 017254 to the flats on the back of the
sprocket and fully tighten the sprocket retaining nut. (This holding relieves the
dynamo shaft of all bending and twisting strains while the sprocket retaining nut is being
tightened.)
Ensure the lock ring
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Fit the dynamo sprocket retaining nut lock washer and lock ring.
lies snugly in the groove cut in the nut.
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Fit engine shock absorber cam, spring, cap washer and retaining nut but do not fully
tighten nut.
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Fit the clutch centre and sprocket by :
Place on the gear box main shaft the thicker of the two clutch sprocket roller bearing
retaining washers.
Place on the gear box main shaft the clutch sprocket roller bearing ring.
Wit h grease, stick in place on the bearing ring the twenty-four clutch sprocket bearing
rollers.
Introduce clutch sprocket over the rollers.
Place on the gear box main shaft the thin clutch bearing retaining washer.
Push on the splined end of the gear box main shaft the clutch centre.
Fit the plain washer, lock washer and nut that retains the clutch centre but do not
fully tighten the nut.
44
Fit the front chain and lock the clutch centre nut by :
Replace the front driving chain. Ensure the spring connecting link is fitted so that the
closed end of the spring clip faces the direction of rotation.
Engage top gear, apply the rear brake and then fully tighten the nut that retains the clutch
centre to the gear box mainshaft.
Turn up the edge of the lock washer so that it tightly abuts against a flat of the nut.
Fit the clutch plates and springs by :
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Slide into position, in the clutch case attached to the clutch sprocket, a steel plain
clutch plate. (On 350 touring models the first plate must be the one extra thick plate,
ensure the recessed part of the steel plate faces to the clutch centre and thereby
overhangs the flange of the clutch centre.)
Slide into place a clutch friction plate (plate with fabric inserts) and follow with a steel
plain plate, then another friction plate and so on, alternatively, till all plates are fitted.
(Five plain plates and four friction plates on 350 c.c. ; six plain, and five friction on
500 c.c. and all competition models.)
Drop into the spring pressure plate the clutch spring cups.
Show up the spring pressure plate and insert over the studs the clutch springs, retaining
each one a few turns, as fitted, with a clutch spring adjusting nut.
Fully tighten the clutch spring adjusting nuts.
Slacken back, four complete turns, each clutch spring adjusting nut. (An old and broad
screwdriver, specially slotted on the engaging edge, is the most suitable tool for clutch
spring adjustment.)
Engage top gear, apply rear brake and then fully tighten the engine shock absorber
retaining nut.
Check front driving chain for adjustment.
Check dynamo driving chain for adjustment.
Fit outer half of front chaincase by :
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Ensure faces of both halves of chaincase are clean.
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Take off, from the rear brake rod, the adjusting knurled nut.
Ensure the rubber and metal bands are clean and undamaged.
A new type of rubber band is now used and this has a " T " section. It is not symmetrical
and the wider top flange or edge should be outwards.
Apply the rubber band by placing the narrow edge on the rear portion of the chaincase,
arranging it so that the join in the band occurs just to the rear of the battery carrier, and
applying the band first of all to the extreme forward edge of the chaincase.
Fully depress the brake pedal and then place in position the front half of the chaincase,
moving it as may be necessary to ensure its outer edges snap under the exposed part of
the rubber band, and then fit to the centre fixing bolt the plain washer and nut, tightening
the nut fully home.
Fit the metal band, starting at the front end of the chaincase and drawing together the
two free ends of the band with one hand while, with the other hand, replacing its binding
screw.
Fully tighten the metal band binding screw.
Remove the inspection cap from the chaincase and pour in engine oil to the level of the
bottom edge of the inspection cap orifice and then replace the cap.
NOTE—If, after replacing a front chaincase, it is found not to be oil tight, the general
reason is distortion of the two joint faces. These faces must be undamaged and,
on test, should closely fit to a surface plate. They must also be absolutely
clean before replacement and the edges must be in exact register, one with
the other. Any distortion caused by accidental impact must be remedied
before refitting.
If any doubt exists, CHECK for DISTORTION BEFORE ASSEMBLY.
45
THE CLUTCH (See Illustration 17)
It should be noted that, although the basic design of the clutch fitted to 1951 models
is identical to the 1950 and earlier models, most parts have been revised in detail design,
and those parts are not interchangeable with those of previous years.
Clutch operating lever A is moved in direction of arrow to disengage the clutch.
Operation of clutch handlebar lever moves lever A in direction of arrow and causes it
to press against operating plunger B, which, in turn, presses against steel ball C, against
the clutch thrust rod D which pushes against the clutch spring pressure plate F.
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This action compresses the clutch springs M so that their pressure is released from
compressing the clutch plain plates G and the clutch friction plates H, thereby allowing
the engine to drive the clutch sprocket L without imparting power, and motion, to the
gear box mainshaft T. Consequently no power is transmitted to the rear wheel and the
clutch is said to be " out " or free.
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On allowing the clutch handlebar lever to return to its normal position the clutch operating lever becomes " free " and the clutch spring pressure causes the clutch thrust rod D,
the steel ball C and the operating plunger B to move to the right.
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The whole of the clutch spring pressure is thereby transferred to the clutch spring pressure
plate F and this forces the steel plates G tightly against the clutch friction plates H so that
power, transmitted by the engine to clutch sprocket L, is transferred through clutch
case J to friction plates H, to steel plates G, to clutch centre E which causes the gear box
mainshaft to revolve.
Illustration 17
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Showing clutch, gear box main shaft and clutch operating mechanism
CLUTCH SPRING ADJUSTMENT
If clutch slip is experienced the most probable cause is incorrect cable adjustment.
If the clutch cable adjustment is found to be correct, i.e., there is the clearance of Q inch
mentioned in the following paragraph, the clutch spring adjustment nuts should be adjusted.
To adjust clutch spring adjustment nuts :
Obtain access to clutch spring adjustment nuts by removing outer half of front chaincase.
Screw home one-half of a complete turn, each clutch spring adjustment nut and then test
for clutch slip.
If necessary, repeat, by screwing home a further half-turn but be careful to adjust each
of the nuts a similar amount.
46
If, to remedy clutch slip, it is necessary to screw nearly home the five nuts, this is a clear
indication that, either the clutch springs have lost their strength, and/or, the fabric
inserts in the clutch friction plates have worn so that they are past further useful service.
In which case, replace with new.
The standard setting of the clutch spring adjusting nuts is obtained by fully tightening
all five nuts and then unscrewing each exactly four complete turns.
CLUTCH ADJUSTMENT
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Minor adjustment of the clutch operating mechanism is obtained by screwing, in or out,
the clutch cable adjuster located in the back of the kick-starter case.
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Major adjustment of the clutch operating mechanism is obtained by altering the position
of the fulcrum pin of the clutch operating lever in the kick-starter case. (Lever A in
Illustration 17 and 175-X-4 in Illustration 18.)
The Major adjustment is explained below.
175-X-4 is the gear box clutch operating lever, and 66-X-7 is the pin on which it hinges.
329-X is the operating lever fork and this slides in the kick-starter case cover, its position
being determined by the sleeve nut 331-X,
Cap 328-X is secured to the outside of the kick-starter case cover, being fixed by the
two screws 333-X and acts as a locking device for the sleeve nut 331-X.
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It is essential that there is about Q" clearance between the operating plunger 330-X
and the nose on operating lever 175-X-4 when the clutch is in the engaged, or driving,
position. This clearance is easily checked by removing the filler cap when it should be
possible, with finger pressure only, to move the clutch withdrawal lever 175-X-4, the
top end of which lies just beneath the filler cap orifice, about W" to and fro. This
amount of free movement at the extreme tip represents approximately the clearance of
Q " specified above.
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It will be appreciated that, as the result of wear on the fabric inserts in the clutch friction
plates, the plates will tend to close up towards each other. This increases the effective
length of the clutch thrust rod. On the other hand, the clutch control inner wire tends
to stretch in use. These two actions will neutralise each other but the fact remains that,
from time to time, it is necessary to adjust the rod clearance and also take up cable stretch.
Clutch slip caused by the clutch thrust rod permanently bearing on the spring pressure
plate will rapidly ruin the fabric inserts and thrust rod. In addition, the heat generated
by this may be so intense that the hardening of the clutch springs and the two ends of
the thrust rod may be adversely affected.
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Therefore, the importance of correct adjustment, and inspection of same to see the
adjustment is maintained, must be stressed.
Obtain adjustment of clutch mechanism by :
Remove the two screws 333-X.
Take away the cap 328-X.
Adjust the sleeve nut 331-X as may be necessary, as follows :
To increase clearance between clutch operating lever 175-X-4 and operating plunger
330-X, turn sleeve nut in a right-hand, or clockwise, direction.
To decrease clearance between clutch operating lever 175-X-4 and operating plunger
330-X, turn sleeve nut in a left-hand, or anti-clockwise, direction.
One or two turns should be ample.
Replace cap and screws.
47
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Illustration 18
Details of clutch operating lever
175-X-4
67-X
330-X
66-X-7
329-X
LEVER, OPERATING C L U T C H .
BALL
(STEEL),
FOR OPERATING
PLUNGER.
OPERATING PLUNGER.
PIN, OR AXLE, FOR OPERATING
LEVER.
FORK, FOR OPERATING LEVER.
331-X
328-X
333-X
SLEEVE, OR NUT, FOR OPERATING
LEVER FORK.
CAP, COVERING SLEEVE (SCREWED
TO KICK-STARTER CASE COVER).
SCREW, FIXING CAP TO KICKSTARTER CASE COVER.
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CLUTCH CABLE ADJUSTMENT
Minor adjustment of the clutch operating mechanism is obtained by :
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Slacken lock nut on the cable adjuster screwed into the back of the kick-starter case.
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To decrease the effective length of the clutch control cable, i.e., to take up play between
the control and the clutch thrust rod, unscrew the cable adjuster from the kick-starter
case. A few turns should be ample.
To provide a greater amount of play, screw into the kick-starter case the cable adjuster.
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Finally, tighten lock nut on cable adjuster.
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NOTE—The amount of play, or free movement, can easily be discovered by virtue of the
greatly increased resistance of the handlebar clutch control lever as the declutching action commences.
To remove a clutch control cable
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Remove the oil filler cap from the kick-starter case cover.
Screw right home the clutch cable adjuster that is located in the back of the kick-starter
case.
Disengage, from the operating lever, the clutch cable inner wire by operating through
the oil filler cap opening.
Completely unscrew the clutch cable adjuster.
Disengage, from the handlebar operating control lever, the clutch inner wire.
Pull cable, by its lower end, till removed from the machine, easing it through the frame
cable clips while doing so.
To replace a clutch control cable
Reverse the above instructions and, finally, adjust as detailed in the previous paragraph.
48
FRONT CHAIN ADJUSTMENT
Tighten the front chain by :
Slacken : Nut on right-hand side of gear box top fixing bolt.
Nut on right-hand side of gear box bottom fixing bolt.
Forward nut on the adjusting eye-bolt.
(Two or three turns.)
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Remove inspection cap from front chaincase.
Screw up the rear nut on adjusting eye-bolt until, with the finger through the inspection
cap orifice, it can be felt that the chain is dead tight. Then slack off the rear nut and
carefully tighten the forward nut until the correct chain tension is obtained, after which
securely tighten the rear nut to lock the assembly. (The correct chain whip is a inch.)
Check the adjustment in more than one position and adjust, as above, at tightest place.
It is important that these instructions to over-tighten and then slack back
are carefully followed.
Tighten nuts on gear box top and bottom fixing bolts.
Replace chaincase inspection cap.
REAR CHAIN ADJUSTMENT (Spring Frame Models)
To provide rear chain adjustment the rear wheel is bodily moved in the rear frame fork
ends which are open ended and slotted.
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The rear wheel centre spindle has two cams attached to it. These cams abut against
projections in each of the rear fork two slotted ends. The projection on the right-hand
fork end is adjusted at the Factory and its position is locked by a nut. That adjustment
is provided to ensure the rear wheel is positioned in line with the front wheel and,
once it has been determined during assembly, there should be no necessity ever to alter
it again.
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The chainside cam has a hexagonal body to accommodate a spanner and is turned, forwards or backwards, to position the rear wheel so that the rear driving chain is correctly
tensioned. (Both cams turn together.)
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The correct chain tension is such that, when the machine is on the centre stand, finger
pressure applied to the chain, midway between gear box sprocket and rear wheel
sprocket, in an upward and downward direction, allows a total movement, up and down,
of 18". The rear wheel should be rotated to several positions and tests made at each,
because chains never wear evenly and there is usually one position where the chain is
tighter than in any other. The adjustment of 18" total whip should be set for the tightest
position found.
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(When off the stand, and with the rider on the saddle, this measurement is reduced to
about ½" total whip, which is the correct adjustment when on the road.)
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To adjust the rear chain
Place the machine on the centre stand.
Slacken nut to right of speedometer gear box.
Slacken exterior nut on left-hand end of rear wheel spindle.
Push forward the wheel so that both cams are in contact with the projections on the
rear fork ends.
Apply adjustable wrench 017249 to hexagonal body of chainside cam, and, while
maintaining a forward pressure on the wheel, to ensure contact of the two cams, turn,
with the wrench, until the chain whip of 18", detailed above, is obtained. Then holding
the wheel in that position, fully re-tighten the spindle exterior nut.
Finally, fully tighten the nut to the right of the speedometer gear box after being satisfied
that the gear box is in such a position that no strain is being placed on the driving cable.
49
REAR CHAIN ADJUSTMENT (Rigid Frame Models)
To provide rear chain adjustment the rear wheel is bodily moved in the frame fork ends,
which are open ended and slotted.
Tighten rear chain by :
Place machine on rear stand.
Slightly slacken nuts on rear wheel solid spindle (left side first).
Slacken nut on each chain adjusting bolt, two or three turns.
forward end of each frame fork end.)
(These bolts screw into
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Screw, in turn, each chain adjusting bolt, further into the fork ends until the chain
tension is correct. Each bolt must be turned the same amount. The chain whip should
be a" to ½".
Tighten wheel spindle nuts.
Re-check chain tension.
Tighten nuts on chain adjusting bolts.
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Check adjustment, in more than one position, by partly revolving the rear wheel.
NOTES ON REAR CHAIN ADJUSTMENT
Before tightening the rear chain, check the front chain adjustment, and, if attention is
necessary, adjust the front chain first.
Altering the adjustment of the front chain upsets the adjustment of the rear chain.
Therefore, after making a front chain adjustment, always check the rear chain adjustment
and re-set if necessary.
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Altering the adjustment of the rear chain may upset the adjustment of the rear brake.
Therefore, after making a rear chain adjustment, always check the brake adjustment
and re-set if necessary.
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The whip of chains should always be tested mid-way between the two sprockets, and the
sprockets should be turned and tests made in several positions. This is because chains
never wear evenly, and there is usually one position where the chain is tighter than in
any other. The adjustment should be set for the tightest position found.
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Always re-check the chain tension after making it and tightening all bolts and nuts.
DYNAMO CHAIN ADJUSTMENT
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The dynamo armature shaft is eccentric to the body of the dynamo. Therefore, by
partially revolving the dynamo in its housing the distance between the two dynamo
driving sprockets can be varied, thereby allowing latitude for chain adjustment.
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Tighten dynamo chain by :
Remove inspection cap from front chaincase.
Slacken dynamo clamping strap bolt.
Apply spanner 017254 to the flats cast on the dynamo end plate (left-hand side of
dynamo) and rotate dynamo, in an anti-clockwise direction till, by passing a finger
through the inspection cap opening, it can be felt the chain tension is correct.
The chain whip should be about ¼". Ensure, when feeling tension, the front driving
chain is not confused with the dynamo chain which lies behind the front driving chain.
Tighten dynamo clamping strap bolt.
Re-check chain tension.
Replace chaincase inspection cap.
50
MAGNETO CHAIN ADJUSTMENT
The magneto platform hinges on one of its fixing bolts. This provides sufficient movement for adjustment to the magneto driving chain.
Tighten magneto chain by :
Remove magneto chain case cover.
Slacken nuts on bolts supporting magneto platform.
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Insert a screwdriver under that end of the magneto platform which is slotted and lever
upwards until the chain tension is correct.
The chain whip should be about ¼".
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Tighten nuts on platform supporting bolts.
Re-check chain tension.
Place supply of grease on magneto driving chain.
Replace magneto chain cover.
ENGINE SHOCK ABSORBER
The engine shock absorber is a spring device for smoothing out the impulses transmitted
by the engine.
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The engine sprocket is a free fit on the driving side flywheel axle. It has, integral with it,
a face cam that engages with a similar face cam (" shock absorber cam ") which is keyed
to the driving side flywheel axle by splines. A spring keeps the shock absorber cam in
close engagement with the cam on the sprocket, and, the shock absorber cam being
driven by the engine, over-rides the sprocket cam under the influence of the engine
impulses. The shock absorber spring is compressed by the over-riding of the cams,
thereby absorbing the shocks.
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It is essential the faces of the cams are adequately lubricated otherwise the shock absorbing
action will be nullified and this is automatically taken care of, providing the level of the
oil in the front chaincase is maintained according to the instructions given in the
" Lubrication Section."
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The shock absorber spring is retained by a cap washer and a retaining nut which must
be fully tightened.
The dynamo sprocket is integral with the engine sprocket.
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Behind the engine sprocket (between the sprocket and the crankshaft roller bearing)
is a spacing collar which is a sliding fit on the driving side flywheel axle and in no circumstances must this be omitted.
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NOTE—At the first sign of transmission harshness examine front chaincase for correct
oil level, and dismantle and lubricate the shock absorber parts if the harshness
continues. For access to the shock absorber parts it is necessary to remove
the outer half of the front chaincase.
The order of assembly of the engine shock absorber is
1
2
3
4
5
6
The
The
The
The
The
The
spacing collar between the crankshaft roller bearing and the engine sprocket.
engine sprocket.
shock absorber cam.
shock absorber spring.
cap washer.
retaining nut.
51
FORK & FRAME SERVICE
STEERING HEAD ADJUSTMENT
The steering head frame races are of the floating self-aligning type and have spherical seats.
Therefore they do not fit tightly in the head lug.
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Occasionally test the steering head for correct adjustment by exerting pressure upwards
from the extreme ends of the handlebars.
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It is particularly important that the adjustment is tested after the first one hundred miles
because of the initial settling down that always occurs in that period.
Should any shake be apparent, adjust the steering head bearings.
Adjust steering head bearings by :
Jack up the front of the machine so that all weight is taken off the front wheel.
under each footrest serves that purpose.)
(A box
Slacken the nuts on the two fork crown studs.
Slacken the domed nut at top of the steering column.
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Screw down the nut underneath the domed nut a little at a time (using spanner 017255)
and, while doing so, test the head assembly for slackness by placing the fingers over the
gap between handlebar lug and frame top lug, at the same time exerting upward pressure
by lifting from the front edge of the front mudguard.
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Continue to tighten the lower adjusting nut until no perceptible movement can be felt
and yet the steering head is perfectly free to turn, then tighten down the domed nut
in order to lock the adjustment.
Tighten the two fork crown pinch stud nuts,
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Remove packing from under footrest.
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FRONT FORKS (TELEDRAULIC)
Owing to the unusual construction of the " TELEDRAULIC " fork it is desirable to
understand what, happens in use and, in order to follow clearly the descriptions and
subsequent assembly and adjustment instructions, reference to Illustrations 19 and 20
will be necessary.
As will be seen from the general arrangement drawing, Illustration 20, the main members
of the forks are two long tubes. These are of heavy gauge and are externally ground
to very fine limits. These fork main, inner, tubes are firmly fixed to the handlebar
clip lug by the top bolts 016718 and are clamped to the fork crown by the clamping
studs 016320 and nuts 011635. Upon the external of these tubes are mounted the
springs and sliding members, to which latter the front wheel, mudguards and front
stand are fixed.
The telescopic action of the sliders, combined with the hydraulic dampers, described
later, explain the word " Teledraulic " coined for the description of the fork.
52
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Introduced in early 1941, for use under strenuous war conditions by all the allied armies,
it remains unaltered, except in detail, to this day, and copied practically universally. The
hydraulic dampers operate in t u b u l a r members located inside the main tubes. As w i l l
be seen the aluminium sliding members operate upon steel bushes attached to the b o t t o m
ends of the main tubes and also upon bakelite bushes, secured to the t o p end of t h e
sliders themselves. Above these bushes, an oil seal is f i t t e d , t h e object of which is to
prevent leakage of oil f r o m below i n t o the main spring chamber. The normal level of
o i l is well above the b o t t o m e x t r e m i t y of the main inner tubes and bearing this in m i n d ,
it is at once clear t h a t upward movement of the sliders resulting f r o m impact w i t h road
bumps in addition to meeting resistance f r o m the main springs also causes oil to be ejected
by the close f i t t i n g steel bushes. This oil is forced upward t h r o u g h the open ends of t h e
main inner tubes and also t h r o u g h the holes A (Illustration 19) in the b o t t o m of t h e
damper tubes, t h e n past the damper disc valve which the passing oil raises off its seat.
As the oil level rises inside the main inner tubes, air trapped is compressed, thereby
f o r m i n g an air buffer acting as auxiliary to the main springs.
This displacement of
oil upon impact imposes a certain amount of damper effect, t h e e x t e n t of which
increases w i t h t h e violence of the shock, or in o t h e r w o r d s , the bigger the bump
the greater the damping effect. U p o n the recoil movement, the damper disc valve
returns to its seat and the oil trapped between this valve and t h e plunger sleeve above
Illustration 19
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has no o t h e r source of escape but past this sleeve and the adjacent small metered bleed
hole. This intentionally restricted passage causes a considerable damper effect to the
recoil action. It w i l l thus be gathered t h a t on the shock movement of the f o r k , slight
damper action occurs, w i t h a greatly increased damper action on the reverse movement,
b o t h actions automatically increasing in effect the more violent the movement.
Before
concluding this description, it should be mentioned that upon a very violent impact, as a
result of which the main springs are almost fully compressed, the damping of the upward
movement of the sliders is intentionally increased by the automatically greatly restricted
passage f o r the displaced o i l , brought about by the l o w e r ends of the main tubes encircling
t h e tapered enlarged ends of the damper tubes as the sliders near the l i m i t of t h e i r upw a r d movement. Thus b o t t o m i n g is prevented, no matter how violent the impact. For
o r d i n a r y purposes t h e recommended oil c o n t e n t is 6½ ozs. (184·6 c.c.) each leg of one of
t h e S.A.E. 20 oils specified. To deal w i t h heavier loads than normal, the oil content may
be increased to a permissable maximum of 10 fluid ozs. (284 c.c.) per leg.
To increase
damping oil of heavier grade may be used. It w i l l be found, however, t h a t f o r normal
purposes the recommended grade and quantity of oil w i l l give the most comfortable ride.
FRONT FORK "TOPPING U P "
No part of t h e T E L E D R A U L I C Front Fork requires individual lubrication, but it is
advisable to check the oil content, once every five thousand miles. The normal content
as already stated, is 6½ fluid ounces (184·6 c.c.) each side.
Support m o t o r cycle vertically w i t h weight on both wheels.
rest is the best m e t h o d .
A steady under each foot-
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Unscrew the hexagonal plugs at t o p of f o r k inner tubes. These are on level w i t h handlebars and attached to t h e m are the damper rods. Have a graduated measure of not less
than 10 fluid ozs. capacity available in which to catch and measure the o i l . Remove the
drain plug f r o m the b o t t o m of a slider and catch the oil which drains out. Then reinsert
drain plug and w o r k the t o p plugs to which damper rods are attached up and d o w n
(pumping action), making upward strokes as violent as possible but using only fingers to
do so. This pumping action is to eject any oil trapped in the damper tubes above t h e
damper disc valve. W a i t t w o minutes and again remove drain plug. Repeat the action
u n t i l no f u r t h e r oil can be drained off when, if the f o r k had the correct oil content, about
6 fluid ozs. (170·4 c.c.) w i l l have been drained off.
If less, add to make this quantity, or
reduce if an excess quantity has been drained off. N e x t refit drain plug and carefully
pour i n t o the t o p of the t u b e being checked exactly 6 fluid ozs. (170·4 c . c ) , after which
the t o p plug may be replaced.
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N O T E — A l t h o u g h the normal oil content of each side is specified as 6½ fluid ozs., it is n o t
possible to drain all the oil via the drain plug. This explains the lesser quantity
of 6 fluid ozs. (170·4 c.c.) referred to above. However, if the f o r k is at any t i m e
completely dismantled and then reassembled in a d r y state, it should be noted
t h a t in that event the correct quantity of oil to add to each leg is 6½ fluid ozs.
(184·6 c . c ) .
TO REMOVE THE COMPLETE FRONT FORK ASSEMBLY
(A box, of suitable
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Support the machine with the front wheel clear of the ground.
height, under each footrest is the best method.)
Remove front wheel by method described in Wheel Section.
Remove front stand and front mudguard.
Detach the switch panel that is held to the top of the head lamp by three screws.
Disconnect speedometer driving cable from the speedometer head.
Detach the speedometer light bulb with its holder.
Remove the two bolts retaining the head lamp and take same away.
Remove the two bolts retaining the speedometer head and take same away.
Remove the handlebar half clip and lay the handlebars, complete with controls, upon a
pad on top of the petrol tank.
Detach the front brake cable from the forks.
then completely unscrew the cable adjuster.)
54
(First remove the slotted yoke end and
Unscrew the hexagon plug on top of each inner tube and slacken the lock nuts securing
the damper rods attached. Then, before removing the hexagon plugs, attach a piece of
wire about 18 inches long underneath each damper rod lock nut, to enable the damper
rods to be raised for reassembly.
Remove domed lock nut at top of steering column.
Remove lock nut on steering column.
To re-fit a complete front fork assembly
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Stick, with grease, 28 balls in fork crown bail race.
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Use a soft mallet to tap upward the handlebar lug until it disengages with the fork stem
(steering column) and the fork assembly can then be withdrawn. (Take care to avoid
loss of the 56 steering head steel balls.)
Stick, with grease, 28 balls in main frame top ball race.
Proceed to fit fork assembly by reversing the instructions given above to dismantle,
carefully retightening the damper rod locknuts before inserting the hexagonal headed
plugs to which they are attached.
TO REMOVE A FORK SLIDER (either side)
Support the motor cycle with the front wheel clear of the ground, and unscrew the
tubular slider extension from the slider which it is intended to remove. (Two holes for
the application of a hooked end spanner are provided).
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Next remove the front wheel, front stand and mudguard as detailed above. Then with a
thin tubular box key, remove the bolt securing the damper tube. The hexagonal head
of the bolt is sunk in the upper half of the wheel spindle clamp. Place a receptacle underneath to catch the oil which will drain out upon removing the bolt, and take care of the
fibre washer located under the head. A sharp jerk downward should now enable the
slider to be withdrawn, but should difficulty be experienced, apply a little heat to the
enlarged top end of the slider. This will cause sufficient expansion to release the oil seal
which is normally a snug push-in fit, in the top of the slider. The re-assembly is carried
out in exactly the reverse order, again if necessary applying a little heat to enable the oil
seal to be pushed down into the slider top before screwing in the slider extension. After
completion, the oil which has escaped M U S T be returned via the top. (See Front Fork
"Topping up.")
TO REMOVE A FORK INNER TUBE ASSEMBLY (either side)
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First unscrew the hexagonal plug at the top of the inner tube it is intended to remove,
and after slackening the lock nut by which the damper rod is secured to this plug, unscrew
the plug, allowing the rod to fall. Next proceed to remove the slider as already detailed,
except do not disturb the bolt securing the damper tube. This damper tube and protruding rod can be removed intact with the slider. Now loosen the fork crown clamping
stud nut when it should be possible to draw the entire inner tube assembly down through
the crown lug. Upon re-assembly, the inner tube is first pushed home as far as possible
by hand and then pulled right home by screwing down the top hexagonal plug. With
this plug tightened down, then proceed to tighten the crown clamping stud nut, after
which the hexagonal plug may be removed and a piece of wire passed down through the
inner tube. Loop the bottom end of this wire underneath the damper rod lock nut.
The slider is then carefully pushed upward while at the same time pulling on the wire
until the top end of the damper rod projects sufficiently to permit the screwed plug to
be attached and secured with the lock nut, after which the wire may be removed. It
may be found necessary to again apply a little heat to enable the oil seal to be pressed
home with the fingers before screwing on the tubular extension.
55
Illustration 20
56
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013632
000485
000203
010713
013509
000011
000004
016072
016339
017357
010721
016304
010719
000005
015932
010697
010706
010710
010692
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017036
014341
003632
000485
000203
013509
000011
000004
010703
013695
012569
016320
000011
011635
017036
010702
010716
016784
at
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
000805
012569
000011
011635
DESCRIPTION
LUG, FOR HANDLEBAR A N D STEERING HEAD.
BOLT, TOP, FOR FORK INNER TUBE.
WASHER, PLAIN, FOR FORK INNER TUBE TOP BOLT.
CAP, FOR FORK TOP COVER TUBE, TOP L O C A T I O N .
TUBE, FORK COVER, TOP, RIGHT W I T H LAMP LUG.
STEM, FOR FORK C R O W N (NO T SOLD SEPARATELY).
BALL RACE, FOR FORK C R O W N .
CAP, FOR FORK TOP COVER TUBE, BOTTOM L O C A T I O N .
WASHER, PLAIN, FOR FORK C R O W N PINCH STUD.
NUT , FOR FORK C R O W N PINCH STUD.
FORK C R O W N ( N O T SOLD SEPARATELY).
FORK C R O W N ASSEMBLY ( C R O W N , STEM A N D CIRCLIP).
BOSS, ON FORK C R O W N , THREADED TO A C C O M M O D A T E STEERING DAMPER
PLATE FIXING BOLT.
TUBE, FORK COVER, BOTTOM.
EXTENSION, FOR FORK SLIDER.
SLIDER, FOR FORK, W I T H CAP, STUDS A N D NUTS.
SCREW, PLUG, FOR FORK SLIDER OIL DRAIN HOLE.
WASHER, FIBRE, FOR FORK SLIDER DRAIN HOLE SCREW.
CAP, FOR FORK SLIDER.
WASHER, PLAIN, FOR FORK SLIDER CAP SECURING STUD.
NUT , FOR FORK SLIDER CAP SECURING STUD.
CAP, FOR FORK TOP COVER TUBE, TOP L O C A T I O N .
TUBE, FORK COVER, TOP, LEFT W I T H LAMP LUG.
CAP, FOR FORK TOP COVER TUBE, BOTTOM L O C A T I O N .
STUD, PINCH, FOR FORK C R O W N .
WASHER, PLAIN, FOR FORK C R O W N PINCH STUD.
NUT , FOR FORK C R O W N PINCH STUD.
TUBE, FORK COVER, BOTTOM.
PLATE, PLAIN, LOCATING BOTTOM COVER TUBE.
SCREW, RETAINING BOTH LOCATING PLATES.
HOLES, THREADED, TO ACCOMMODATE BRAKE A N C H O R STAY.
SLIDER, FOR FORK, W I T H CAP, STUDS A N D NUTS.
SCREW, PLUG, FOR FORK SLIDER OIL DRAIN HOLE.
WASHER, FIBRE, FOR FORK SLIDER DRAIN HOLE SCREW.
STUD, SECURING CAP TO FORK SLIDER.
CAP, FOR FORK SLIDER.
WASHER, PLAIN, FOR FORK SLIDER CAP SECURING STUD.
NUT , FOR FORK SLIDER CAP SECURING STUD.
SLEEVE, PLUNGER, FORK DAMPER ROD.
CLIP, RETAINING DAMPER ROD SLEEVE.
ROD, FOR DAMPER FORK.
PIN, STOP, FOR FORK DAMPER VALVE.
VALVE, FOR FORK DAMPER.
SEAT, FOR FORK DAMPER VALVE.
N U T , LOCK, FOR DAMPER VALVE SEAT.
TUBE, FOR FORK DAMPER.
BOLT, FIXING DAMPER TUBE TO SLIDER.
WASHER, FIBRE, FOR DAMPER TUBE BOLT.
CIRCLIP, FOR INNER TUBE BOTTOM BUSH.
BUSH, BOTTOM, FOR INNER TUBE.
GROOVE, FOR CIRCLIP 010710.
SPRING, BUFFER, FOR FRONT FORK.
BUSH, TOP, PLASTIC, FOR INNER TUBE.
OIL SEAL, FOR INNER TUBE.
TUBE, FORK, INNER.
EXTENSION, FOR FORK SLIDER.
WASHER, LEATHER, FORK SPRING SEATING.
SPRING, MAIN, FOR FRONT FORK.
BUFFER, RUBBER, FORK, INNER TUBE.
WASHER, LEATHER, FORK SPRING SEATING.
WASHER, PLAIN, FOR INNER TUBE TOP BOLT.
RING, SEALING, FOR INNER TUBE TOP BOLT.
PLUG FOR TOP OF INNER TUBE.
NUT , LOCK, TOP END OF DAMPER ROD.
PLATE, THREADED, LOCATING TOP COVER TUBE.
NUT , FOR HANDLEBAR CLIP STUD.
WASHER, PLAIN, FOR HANDLEBAR CLIP STUD.
CLIP (HALF ONLY), FOR HANDLEBAR LUG.
STUD, FOR HANDLEBAR CLIP.
NUT , LOCK (DOMED) FOR FORK STEM.
NUT , ADJUSTING, FOR FORK STEM.
NIPPLE, GREASE, FOR HEAD BALL RACES.
HOLES TO ACCOMMODAT E BOLTS FIXING SPEEDOMETER HEAD-
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PART
NUMBER
013631
016718
010709
010703
013694
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REF.
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
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010360
015286
010718
016322
014341
010698
016526
016148
010698
010709
014355
016718
000004
010701
014278
000012
013629
012870
010712
000236
000051
57
REAR SUSPENSION (Spring Frame Models)
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The rear wheel is mounted in a fork that is hinged just behind the gear box. The hinge
has robust plain bearings lubricated from a reservoir of 1½ fluid ounces (42.6 c.c.) of
engine oil which is sufficient to last almost indefinitely. Provision is, however, made for
replenishment should same ever be required. A small screw will be observed in the
right-hand end cap of the hinge bearing, upon removal of this screw, oil can be injected
into the reservoir, the screw orifice operating as a level control.
Illustration 21
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Showing rear sprung frame and " TELEDRAULIC " legs
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The rear wheel fork is suspended on springs located in the two " TELEDRAULIC "
legs joining the rear of the fork to the main frame rear loops, and the spring action is
damped by hydraulic dampers identical in design to those used in the " T E L E D R A U L I C "
Front Fork Assembly.
The hydraulic fluid used is one of the grades of oil specified in the Lubrication Section
for use in the " TELEDRAULIC " Front Forks.
The recommended quantity for each leg is 85 c.c. or a trifle under 3 fluid ozs. of S.A.E. 20
grade of one of the brands specified. For abnormal loads, the next heavier S.A.E.
grade may be used, but unlike the front fork, recoil damping as well as maximum load
capacity is increased by this alteration of grade alone, and under no circumstances should
the oil content of each leg exceed 90 c.c. or roughly 38 fluid ozs. Unless serious doubt
exists as to the correct functioning of the rear legs, owners are advised to leave well alone.
Should the need arise, however, the oil content of each leg should be separately checked
as follows :
58
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Illustration 22
Showing " Ghost " view of " TELEDRAULIC " leg
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To check oil content of " TELEDRAULIC " leg and top-up :
(DEALERS' SERVICE ONLY)
Dealing with one leg at a time, remove top securing bolt, taking care to observe the
location of the spacing washers on it. Remove bottom securing bolt and take away the
leg.
Using a suitable clamp encircling the outer tube adjacent to the bottom pivot lug, grip
in a vice and loosen the pivot lug. Then holding leg vertically, bottom end uppermost,
carefully remove the loosened pivot lug, and gripping the exposed end of the damper
tube with the fingers, raise and lower several times (pumping action) after which pour
the oil contents into a graduated measure. It may be necessary to repeat the pumping
action to eject oil from underneath the damper valve, and finally the open end of tube
should be supported above the measure and left to drain for several minutes. If the leg
contained the correct amount of oil, 75 c.c. (2s ozs.) should have been drained out into
the graduated measure, leaving 10 c.c. (3 oz.) which cannot be withdrawn. All that now
remains is to pour carefully back into the leg exactly 75 c.c. (2s ozs.) of oil, after which
the pivot lug may again be screwed on and securely tightened down to prevent oil
leakage when the leg is re-fitted, after which the other leg may be dealt with in a similar
manner.
PROP STAND
The prop stand hinges on a bolt which passes through a lug brazed to the frame and screws
into the jaw of the stand leg. It is then locked by a nut and split pin. Care in tightening
this bolt is necessary to avoid pinching, and it is essential to observe after securely
tightening the lock nut that the stand is perfectly free. Smear the hinge bolt with engine
oil before replacing it.
CENTRE STAND (Spring Frame Models)
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The centre stand is mounted on a bolt set across the bottom rear of the main frame and is
removed by taking off a nut of the centre bolt and pushing bolt through the frame.
During removal and replacement the stand should be in a horizontal position in order
to take off as much of the tension of the return spring as is possible.
FRONT STAND
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The front stand is intended to operate only as a support and care is necessary, when
using, to avoid passing the vertical position. No stops are provided and dragging the
machine backward, with the stands down, is likely to fracture the lugs on the aluminium
sliders of the forks to which the stand is attached.
Do not attempt to use the FRONT STAND unless the machine is already
supported by the centre stand.
REAR STAND (Rigid Frame Models)
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A plain steel washer is fitted under the H E A D of each of the two bolts that retain the
rear stand to the fork ends. The washers should N O T be fitted UNDER the nuts
of those bolts.
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TO REMOVE OIL TANK AND BATTERY CARRIER
Two studs on the seat tube, one facing to the front, the other facing to the rear, engage
with two right-angle stays on the oil tank and two similar stays on the battery carrier,
and two washers and two nuts, fitted to the studs, retain the oil tank and battery carrier
in position.
Remove oil tank and battery carrier by :
Drain oil tank.
Disconnect negative wire from the battery where it is attached to the seat lug bolt by
a screw.
Disconnect positive wire from the battery at the point, close to the battery, where there
is a double screwed connector. (Pull back the rubber sleeve to reveal the two main
components of the connector. Hold one component in a wrench, or pliers, while the
second component is unscrewed from it.)
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Remove battery from carrier.
Disconnect oil feed pipe from bottom of oil tank.
Disconnect oil return pipe from bottom of oil tank.
Disconnect vent pipe from back of oil tank.
Disconnect voltage control unit from carrier side. Only two bolts to remove. No
need to disconnect any of the electric cables.
Remove bolt retaining rear stay from oil tank to rear mudguard.
Remove screw, in base of carrier, retaining carrier to stay that is supported by the front
chaincase.
Remove the two nuts and washers retaining the oil tank and battery carrier to the two
studs.
Oil tank and battery carrier are now free to be taken away and, when doing so it is
necessary to give each a slight rotary movement in order to disengage from the frame studs.
NOTE?—The frame studs are brazed to the frame.
To re-fit
Locate tank and battery carrier on their two fixing studs and, before doing anything
else, fit both oil pipes. Then reverse the instructions given above.
TO REMOVE THE REAR CHAIN GUARD (Spring Frame Models)
Remove the rear wheel. (See Wheel Section.)
Remove the bolt retaining the front end of the chain guard to the rear fork.
Remove the bolt retaining the rear end of the chain guard to the rear fork. (There are
two spacers on this bolt, one is between the two sides of the guard and the other is
between the head of the fixing bolt and the guard.)
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TO R E M O V E T H E REAR C H A I N G U A R D (Rigid Frame Models)
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Remove
The rear portion of rear mudguard.
The bolt retaining the front, top, end of the chain guard to the front chaincase.
The bolt retaining the front, bottom, end of the chain guard to the rear frame.
The bolt retaining the rear, top, end of the chain guard to the rear frame.
The chain guard is then free to be taken away.
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GENUINE A.J.S. SPARES
PURCHASED FROM
AN AUTHORISED
"A.J.S."
DEALER
OR FROM THE FACTORY, ARE IDENTICAL
WITH THE PARTS ORIGINALLY BUILT
INTO YOUR MOTOR CYCLE
BY USING GENUINE SPARES YOU ARE ASSURED THEY
WILL FIT ACCURATELY AND GIVE SATISFACTORY SERVICE
61
WHEELS AND BRAKES
TO REMOVE FRONT WHEEL
Place machine on both stands.
Remove the split pin, and pin, retaining yoke end of front brake cable to the brake
expander lever.
Slacken the nut on the left-hand end of front wheel spindle.
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Remove bolt retaining brake anchor stay to brake cover plate.
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Remove the four nuts retaining the caps to the fork sliders, which will permit the removal
of the two caps and, putting pressure on the front wheel (in order to decrease the
effective height of the wheel spindle) the wheel can be withdrawn towards the front.
NOTE—The two caps MUST be re-fitted in same order and position as originally.
Therefore, lay them aside so that the order and position of assembly will be
correctly made.
When replacing the front wheel, observe the instructions already given in the Fork and
Frame Section and remember to depress the wheel when placing in position to get the
wheel spindle between the two sets of studs that retain the slider caps.
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Do not attempt to use the FRONT STAND unless the machine is supported
by the centre standi (on SPRING FRAME MODELS) or by the REAR STAND
(on RIGID FRAME MODELS).
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TO REMOVE REAR WHEEL (Spring Frame Models)
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Place the machine on the centre stand. Remove the bolt, washer and nut, in rearmost
position on each tubular member fixing the hinged portion of the rear mudguard.
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Disconnect the snap connector in the wire of the rear lamp.
Remove adjusting nut from rear brake rod.
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Revolve rear wheel till the chain connecting link is in its most possible rear-most position.
Remove connecting link and allow chain to come right away from the rear wheel sprocket
but ensure it hangs so it cannot come away from the gear box sprocket.
Disconnect speedometer cable from speedometer gear box by unscrewing the cable
gland nut.
Slacken the nut, on the rear wheel spindle that positions the speedometer gear box.
Slacken both exterior nuts on the rear wheel spindle three complete turns.
Using adjustable wrench 017249, apply it to the hexagonal body of the adjusting cam
on the left-hand end of the wheel axle and turn the cam till, by pushing the wheel
forwards, the wheel is in its most forward possible position.
62
Hold left-hand side of wheel tightly forward against the cam stop and pull backwards
the right-hand side of the wheel so that the brake cover plate disengages with the square
headed anchor bolt. Then, raise the hinged portion of the rear mudguard and pull
wheel away from the fork ends.
TO REMOVE REAR WHEEL (Rigid Frame Models)
Disconnect rear lamp wire at connection near rear wheel spindle.
Disconnect speedometer driving cable.
(Unscrew gland nut on cable.)
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Place machine on rear stand.
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Disconnect rear chain connecting link. (Allow chain to hang clear of the rear wheel
sprocket without becoming disengaged from the gear box small sprocket.)
Remove the two nuts securing rear portion of rear mudguard to its front portion.
Loosen nut and washer from bolt securing mudguard side bridge and tool box stay to
tubular stay.
Remove adjusting nut from rear brake rod.
Slacken the two nuts (unscrew about four turns) retaining the rear mudguard side stays
to their studs.
Slacken the two nuts on the rear wheel spindle.
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Remove the rear portion of the rear mudguard, with its stays, leaving tool box and stay
in position.
Remove the rear wheel from the fork ends by twisting it sideways to release and clear
the rear brake cover plate anchor bolt and then withdrawing it to the rear.
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Re-fit in the reverse order but, before finally tightening the rear wheel spindle nuts,
ensure the speedometer gear box is so positioned that the speedometer driving cable
can be correctly replaced.
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When the wheel alignment is correct a piece of thin string stretched taut across both
wheels, about four inches from, and parallel to, the ground, should just touch each tyre
at both sides of the wheel centres.
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Alternatively, a straight wooden batten, about five feet long, is handy to use for checking
wheel alignment. This should be applied, as in the case of string, parallel to and about
four inches from the ground.
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NOTE—Always check the rear chain tension and the rear brake adjustment after making
an alteration to the rear wheel position.
TO RE-FIT REAR WHEEL (Spring Frame Model)
Reverse the above procedure but leave the tightening of the nut that locates the speedometer gear box for the final operation, i.e., after the speedometer cable has been
re-connected and the exterior axle nuts have been tightened.
It will be found easier to re-fit the wheel to the fork ends with the brake cover plate
hanging free and then, holding the wheel on its left-hand side, as far forward in the fork
end as is possible, to swing the right-hand side backwards, lifting up the free cover plate
so that the slot in it is positioned to engage with the square headed anchor bolt and
then swinging the right-hand end of the axle forwards till engagement has been completed.
After re-fitting the rear wheel, check the rear chain adjustment, and, if necessary, re-set it.
Then check the rear brake adjustment and, if necessary, re-set it.
63
WHEEL BEARINGS AND ADJUSTMENT
The wheel bearings are of taper roller type. The inner bearings for the rollers are
integral with the wheel spindle in the case of the front wheel, and are separate tracks
that are threaded on the centre spindle in the case of the rear wheel, (Reference to
Illustration 24 will make that clear.) The outer cups for the rollers are pressed into the
hub shell. They have a fixed location one side and an adjustable location on the other.
The fixed location is provided by a circlip in a groove cut in one end of the hub shell,
while the adjustable location is regulated by a screwed ring that is threaded into the
opposite end of the hub and the position of which can be locked by an encircling nut.
On the rear wheel the adjusting ring is located on the left-hand side of the hub while,
on the front wheel, the adjustment is on the right-hand side.
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It is rarely necessary to make adjustment to wheel bearings. It is most important they
are not adjusted too tightly as this would quickly ruin them. There must always be a
slight amount of end play. This should be about .002", which represents adjust perceptible
rim rock, (Not more than 1/64" rock.)
To adjust the rear wheel bearings the wheel must first be removed from the machine,
but those of the front wheel can be dealt with in situ,
A service method of ensuring correct adjustment is :
Slacken the lock nut.
Tighten the adjusting ring until all slackness has been taken up.
Slacken back the adjusting ring exactly one-half turn.
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Tighten the lock nut, making sure that, when doing so, the adjusting ring does not creep
round.
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TO DISMANTLE A FRONT WHEEL BEARING
These instructions need reference to the upper part of Illustration 24.
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Remove wheel from machine.
Remove nuts, and brake cover plate with shoes, etc., from left-hand side of wheel.
(11.)
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Turn to right-hand side and slacken lock nut.
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Completely unscrew the adjusting ring (10) and take it away with the lock nut ( I I )
still on it.
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Carefully apply steady pressure on the threaded end of the wheel spindle which will,
in turn, eject from the opposite end of the hub the cup housing for the oil seal (9), the
oil seal (8), the metal washer (7) that is behind the oil seal and the outer cup (6). These
may be lifted away as they emerge.
The front wheel spindle (6), with its two sets of rollers in cages, may now be lifted out
of the hub.
Turn to the left-hand end of the hub, carefully apply steady pressure on the visible
washer (avoiding fouling the circlip that can be seen in the hub end), so that the complete
left-hand assembly of oil seal and outer cup is pushed a trifle further into the hub shell.
This will take off pressure on the circlip, thereby making its extraction an easy matter.
Extract circlip (I), and then, reversing the hub, apply pressure on the inside edge of the
outer cup (6), so that it is forced out of the hub. As it emerges it will push in front of it,
the oil seal external plain washer (2), the oil seal (3), with its encircling spacer collar (4)
and the oil seal inner plain washer (5), all of which can be lifted away as they appear,
to be finally followed by the cup (6).
The dismantling is then completed.
64
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To re-fit, reverse the above procedure, remembering that, after cup (6), washer (5),
spacer (4), oil seal (3) and washer (2) have been inserted in the plain end of the hub,
to re-fit the circlip (I) and then carefully to apply steady pressure on the inner edge of
the cup (6) to force the above entire assembly tightly back against the circlip (1).
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Illustration 23
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Showing rear hub, rear chain sprocket, brake and speedometer gear box
(Spring Frame Model)
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(Rigid Frame Models identical except for items 4-6 and 26)
SPACER, BETWEEN
ROLLER BEARINGS.
THE
TWO
RIGHT-HAND SIDE HUB FLANGE.
14
GREASE NIPPLE ON SPEEDOMETER GEAR
BOX.
15
GREASE NIPPLE, IN HUB SHELL.
3
SPEEDOMETER GEAR BOX.
16
4
SPIGOT BUSH,
FORK END.
OUTER RACE OF
ROLLER BEARING.
17
NUT, LOCKING
RING.
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1
2
IN
RIGHT-HAND
w.
FITS
RIGHT
SIDE
BEARING
TAPER
TAPER
ADJUSTING
NUT, ON CENTRE SOLID SPINDLE.
6
RIGHT-HAND SIDE CAM.
7
NUT, LOCKING SPEEDOMETER
BOX IN POSITION.
8
SPACER, BETWEEN SPEEDOMETER GEAR
BOX A N D RIGHT-HAND SIDE TAPER
ROLLER BEARING.
9
OIL SEAL.
22
BRAKE LINING.
10
COLLAR, ENCIRCLING RIGHT-HAND OIL
SEAL.
23
BRAKE SHOE.
24
II
CIRCLIP, LOCATING RIGHT-HAND SIDE
TAPER ROLLER BEARING.
SPIGOT BUSH, FITS IN LEFT-HAND FORK
END.
25
NUT, ON CENTRE SOLID SPINDLE.
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5
12 WASHER, RETAINING
EACH SIDE OF SEAL).
13
OIL SEAL
SPACER, BETWEEN OIL SEAL
WASHER A N D TAPER BEARING.
GEAR
(ONE
INNER
65
18
RING, FOR ADJUSTING BEARING.
19
ROLLER (PART OF
ROLLER BEARING).
20
BOLT, SECURING BRAKE
SPROCKET TO HUB.
21
REAR BRAKE COVER PLATE.
LEFT
SIDE
TAPER
DRUM
26
LEFT-HAND SIDE CAM.
27
SPRING, FOR BRAKE SHOE.
28
BRAKE DRUM A N D SPROCKET.
AND
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Illustration 24
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Showing exploded view of hub bearing components in the order of
assembly. Upper part is that of front bearings (Rigid and Spring
Frame Models). Lower part is that of rear bearings (Spring Frame
Model only)
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(Rigid Frame Models Identical except for items 28 to 32)
1 CIRCLIP.
2 WASHER, METAL, OUTSIDE OIL SEAL.
19
SPACER, BETWEEN BEARINGS.
20
TAPER BEARING (OUTER CUP, CAGE FOR
ROLLERS A N D ROLLERS). T H E S E A R E
N O T SUPPLIED SEPARATELY. ALSO
ROLLERS
ARE
NOT
SUPPLIED
SEPARATELY.
21
SPACER BETWEEN OIL
A N D TAPER BEARING.
22
WASHER, METAL,
A N D SPACER.
23
OIL SEAL.
24
CUP, HOUSING, FOR OIL SEAL.
25
ADJUSTING RING.
26
LOCK NUT, FOR ADJUSTING RING.
27
NUT, EXTERNAL,
SPINDLE.
28
BUSH, FOR REAR WHEEL SPINDLE (FITS
IN FORK END).
29
KEYWAY,
TO
ACCOMMODATE
KEY
LOCKING CAM TO REAR WHEEL SPINDLE.
SEAL
30
REAR WHEEL SOLID CENTRE SPINDLE.
SPACER, BETWEEN OIL SEAL WASHER
A N D TAPER BEARING.
TAPER BEARING (OUTER CUP, CAGE FOR
ROLLERS A N D ROLLERS)
THESE ARE
N O T SUPPLIED SEPARATELY.
ALSO
ROLLERS
ARE
NOT
SUPPLIED
SEPARATELY.
31
KEYWAY,
TO
ACCOMMODATE
KEY
LOCKING CAM TO REAR WHEEL SPINDLE.
32
BUSH, FOR REAR WHEEL SPINDLE (FITS
IN FORK END).
33
NUT, EXTERNAL,
SPINDLE.
OIL SEAL.
5
WASHER, METAL, BETWEEN
A N D TAPER BEARING.
6
OUTER RACES (2 OFF). CENTRE SPINDLE.
ROLLERS IN CAGES (2 SETS). T H E S E
ARE N O T SUPPLIED SEPARATELY.
A L S O , ROLLERS A R E N O T S U P P L I E D
SEPARATELY.
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3
4
SPACING COLLAR, ENCIRCLING OIL SEAL.
WASHER, METAL, BETWEEN
A N D TAPER BEARING.
OIL
SEAL
OIL SEAL.
CUP, HOUSING, FOR OIL SEAL.
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8
SEAL
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7
OIL
9
10 ADJUSTING RING.
11
LOCK NUT, FOR ADJUSTING RING.
12
CIRCLIP.
13
WASHER, METAL, OUTSIDE OIL SEAL.
14
OIL SEAL.
15
SPACING COLLAR, ENCIRCLING OIL SEAL.
16 WASHER, METAL,
A N D SPACER.
17
18
BETWEEN
OIL
66
SEAL WASHER
BETWEEN
FOR
FOR
OIL
REAR
REAR
SEAL
WHEEL
WHEEL
TO
DISMANTLE A
REAR WHEEL BEARING
These instructions need reference to the lower part of Illustration 24.
Remove wheel from machine.
Remove brake cover plate, with brake shoes, centre solid spindle with cams, spacers,
bushes, nut and speedometer gear box.
Turn to left-hand side and slacken lock nut (26).
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Completely unscrew the adjusting ring (25) and take it away with the lock nut (26)
still on it.
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Turn to the right-hand end of the hub and carefully apply steady pressure on the visible
steel washer (avoiding fouling the circlip that can be seen in the hub end), so that, in turn,
the cup housing (24) for the oil seal, the oil seal (23), the metal washer (22) that is behind
the oil seal, the spacing ring (21) that is between the metal washer and the taper bearing,
and outer cup (20) are ejected. These may be lifted away as they emerge.
The rollers in cage (20), the centre spacer (19) and the rollers in cage (18) may now be
lifted out of the hub.
Turn to the right hand end of the hub, carefully apply steady pressure to the visible
washer (avoiding fouling the circlip that can be seen in the hub end), so that the
complete right-hand assembly of oil seal and outer cup is pushed a trifle further into
the hub shell. This will take off pressure on the circlip, thereby making its extraction
an easy matter.
Extract circlip (12).
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Through the open end of the hub carefully apply steady pressure to the inner edge of
the outer cup (18) so that it is forced out of the hub.
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As it emerges, it will push, in front of it, the oil seal plain washer (13), the oil seal (14)
with its encircling spacer collar (15), the oil seal internal plain washer (16) and the spacing
ring (17) between the metal washer and the taper bearing, to be finally followed by the
cup (18).
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The dismantling is then completed.
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To re-fit, reverse the above procedure, remembering that, after cup (18), spacer (17),
washer (16), oil seal (14), spacer (15) and washer (13) have been inserted in the plain end
of the hub, to re-fit the circlip (12) and then carefully to apply steady pressure on the
inner edge of the cup (18) to force the above entire assembly tightly back against the
circlip (12).
FRONT BRAKE COVER PLATE
It is most important the front brake cover plate is correctly positioned.
It is retained to the front wheel spindle by an inside nut (part number 017003)
and an outside nut (part number 013483). Between the inside nut and the brake cover
plate is a locating washer (part number 017222.)
The inside nut should be positioned so that, when the locating washer is placed next to it,
the outside face of the washer is z" proud of the outer edge of the brake drum. (Tested
by placing a straight edge across the edge of the brake drum.)
The outside nut is fitted so that its hexagonal side is against the brake cover plate
67
BRAKE DRUMS
The front wheel brake drum is retained to the wheel by ten countersunk screws.
The rear wheel brake drum is integral with the rear wheel sprocket and is retained to
the wheel hub by five bolts and nuts. Under each nut is a lock washer of the " tab "
type and it is essential these are always in position.
Harshness in transmission can be caused by the drum retaining bolts and nuts being loose.
Rear wheel spokes will break for the same reason.
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BRAKE SHOES
The two
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The front and rear brake shoes, springs and expanders are interchangeable.
shoes in each brake are N O T identical, they are " handed."
One end of each shoe bears on a fulcrum fixed in the brake cover plate. The other end
accommodates a detachable thrust pin. 'By inserting washers under a thrust pin its
effective height can be increased, thereby compensating for wear on the brake linings.
BRAKE SHOE ADJUSTMENT
Brake adjustment, to compensate for lining wear, is normally made by means of a finger
adjuster on the rear brake rod and a cable adjuster for the front brake cable.
After a very considerable mileage this continual adjustment causes the brake cam to
occupy a position whereby the available leverage is considerably reduced and, as a result,
the brake loses efficiency.
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To overcome this a hardened headed thrust
pin is fitted to each shoe to enable a packing
washer to be fitted under the head as, and
when, required. Eight of these washers
(000174) are provided in the tool kit.
When wear of the brake linings is taken up
in this manner it is then necessary to
unscrew considerably the adjusting nut on
the rear brake rod, or screw in the cable
adjuster of the front brake cable, and
afterwards adjust the brake, as described
afterwards.
Illustration 25
When a brake cover plate has been disturbed,
it is advisable, upon re-assembly, to centralise
the shoes in the brake drum to ensure equal
pressure to each. In the case of the front
wheel this is best done before re-fitting the
wheel to the machine, but in the case of the
rear wheel it is best done after re-fitting.
If brake shoes tend to squeak, when the brake
is applied it is generally an indication the
brake shoes are not centralised in the drum.
(1)
(2)
(3)
(4)
(5)
68
Brake shoe thrust pin.
Thrust pin packing washer.
Brake shoe.
Rivet, securing brake shoe lining.
Brake shoe lining.
Centralise brake shoes by :
Ensure the nut binding the cover plate to the wheel spindle is slightly slack.
Place on the brake expander lever a tubular spanner (to increase the leverage), and, while
maintaining pressure on the tubular spanner (to expand fully the brake shoes), fully
tighten the spindle nut binding the cover plate to the spindle.
FRONT BRAKE ADJUSTMENT
Major adjustment of the front brake shoes is made on the brake thrust pins, by fitting
packing washers under the pins, as already described.
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Minor adjustment of the front brake shoes is made by altering the position of the brake
cable adjuster on the fork assembly. Unscrew the adjuster to " take up " t h e front brake.
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The adjuster is locked in position by a nut.
Adjust front brake by :
Place machine on both stands.
Slacken lock nut on cable adjuster.
Unscrew the cable adjuster till, by rotating the front wheel, it can be felt the brake shoes
are just touching the brake drum.
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Illustration 26
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Then screw back the adjuster two complete turns and tighten the lock nut.
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Showing f r o n t brake
cable adjuster thread
exhausted, indicating
brake shoe thrust pin
adjustment
is
necessary.
REAR BRAKE ADJUSTMENT
Major adjustment of the rear brake shoes is made on the brake thrust pins, by fitting
packing washers under the pins, as already described.
Minor adjustment of the rear brake shoes is made by altering the position, on the brake
rod, of the knurled adjusting nut. Screw the nut further on the rod to " take up "
the rear brake.
69
Adjust rear brake by :
Place machine on centre stand if spring frame, otherwise on rear stand.
Screw further on the brake rod the knurled adjusting nut till, by rotating the wheel,
it can be felt the brake shoes are just touching the brake drum.
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Then unscrew the adjusting nut two complete turns. (The adjusting nut is automatically
locked in position in virtue of the two projecting noses on it engaging in accommodating
slots cut in the clip which connects the brake rod and brake expander lever and being
retained in that position by the spring which encircles the rear end of the brake rod.)
Illustration 27
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Showing the rear brake
pedal with its adjusting
bolt and lock nut.
To
permanently raise the toe
end of the pedal, slacken
lock nut (B) and unscrew
the adjusting bolt (A).
(Check back brake adjustment after).
(RIGID FRAME MODELS)
BRAKE PEDAL ADJUSTMENT
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The position of the rear brake pedal can be adjusted within narrow limits. This is done
by means of a bolt screwed into the heel of the pedal. The adjusting bolt is locked by
a nut.
The best position, for normal use, is to position the pedal so that, when the brake is
" off," it is just clear of the under-side of the footrest arm.
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After altering the adjustment of the brake pedal, rear brake adjustment should be checked
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Illustration 28
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Showing brake rod adjustment exhausted, indicating brake shoe thrust pin
adjustment is essential.
(RIGID FRAME MODELS)
RIMS A N D SPOKES
The front and rear rims are each drilled for forty spokes, but they are not interchangeable
because the nipple holes in the front rim are smaller than those in the rear rim. See
" DATA."
The dimensions of spokes will be found in " D A T A . "
70
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Illustration 29
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Showing brake rod adjustment exhausted, indicating the need for
brake thrust pin adjustment.
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(SPRING FRAME MODELS)
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TYRES A N D SERVICE
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Obtaining satisfactory life and service from the tyres is largely a matter within the user's
control because the first essential is correct inflation. Check tyre pressures with a low
pressure gauge at least once a week. Inflate as may be necessary.
aj
Avoid unnecessary, or " stunt," acceleration and fierce braking, which wear out tyres
by causing wheel spin and skid.
w.
Do not drive in tram lines. It is dangerous, especially when wet, and the uprising edges
of worn rails will damage the tyres.
ww
Remove flints, etc., that become embedded in the tread and, if any oil gets on the tyres
or spokes, clean it off with petrol.
Make sure the front and rear wheels are in track. When the wheel alignment is correct,
a piece of thin string stretched taut across both wheels, about four inches from, and
parallel to, the ground, should just touch each tyre at both sides of the wheel centres.
Alternatively, a straight wooden batten, about five feet long, is handy to use for checking
wheel alignment. This should be applied, as in the case of string, parallel to and about
four inches from the ground.
Always check the rear chain adjustment, and the rear brake adjustment, after making an
alteration to the rear wheel position.
71
TYRE REMOVAL
It is not essential to remove a wheel from the machine to repair a puncture but it will
usually be found desirable and more convenient to do so.
Take off outer cover and remove inner tube by :
Remove cap from tyre valve.
Remove nut from tyre valve.
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Remove the " inside " from tyre valve. This allows inner tube to deflate. Most valve
caps have a reduced and slotted top to engage with the valve " inside " in order to
unscrew it.
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Push edge of cover, that is diametrically opposite to the valve, RIGHT I N T O W E L L
OF RIM and, using tyre levers 017007, pick up edge of cover NEAR VALVE so
that it comes off over the edge of the rim.
Work off the remaining edge of the cover till it is clear of the rim.
and there is no reason to use force.
This is quite easy
Push upwards valve stem through its hole in the rim, and the inner tube is then free
to be taken away.
Remove cover from rim by pushing it right into well of rim and, diametrically opposite,
picking it up with the tyre lever and then working it off all the way round.
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TYRE FITTING
Re-fit inner tube and outer cover by :
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Place one edge of cover right into well of rim, with the three white dots on the cover side
adjacent to the valve hole, and, commencing diametrically opposite, and using the
hands only, work the cover over the edge of the rim.
aj
Replace the valve " inside "and slightly inflate the inner tube. (Do not distend the tube.)
Fit the valve into its hole in the rim and replace its nut, only screwing it on the valve
stem about half an inch.
w.
Tuck in the inner tube so that it lies snugly in the cover. Ensure it is not twisted.
Smear some soapy water round the free edge of the cover. This is a great help in fitting
and in ensuring the cover centralises itself on the rim and should always be employed
if at all possible.
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Introduce the free edge of the cover into the rim at the spot diametrically opposite to
the valve. Get this edge right into the well of the rim and then, by working round the
cover, equally on either side of the valve position, the cover will slip into place without
excessive exertion, fitting the part nearest to the valve last of all.
Slightly inflate the inner tube and inspect for the inner tube being trapped between the
outside edge of the cover and the rim at the spots where the valve is located.
Half inflate tyre, spin wheel and test for trueness because it is essential the pattern of the
tread runs evenly and the cover must be manipulated till that occurs. This centralisation of the cover is most important.
Inflate to required pressure.
Screw fully home the nut on the valve.
Replace the valve cap.
72
TYRE PRESSURES
The following are correct minimum inflation pressures for specified loads per tyre :
Load per tyre, 200 lb. Pressure 16 lb. per square inch
do.
240 lb.
do.
18 lb.
do.
do. 20 lb.
do.
280 lb.
do.
350 lb.
do. 24 lb.
do.
do.
400 lb.
do.
do. 28 lb.
do.
440 lb.
do. 32 lb.
do.
do.
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The best method of ascertaining the correct pressure is to actually weigh the loads on
the front and rear tyres. This should be done on a weighbridge and is a service that
can usually be provided by British Railways at a Goods Depot or by a Corporation at
its Depot.
When the weights are known the table above can then be used.
As a rough guide it may be stated that, with a rider of average weight and with normal
equipment, solo, the pressure should be 18 lb. for the front tyre and 22 lb. for the rear.
at
GENUINE
m
A·J·S
SPARES
AUTHORISED “ A • J • S ” DEALER OR
aj
AN
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PURCHASED FROM
w.
FROM
ww
WITH
THE
FACTORY,
THE
PARTS
ARE
IDENTICAL
ORIGINALLY
BUILT
INTO YOUR MOTOR CYCLE.
BY USING GENUINE SPARES YOU ARE ASSURED THEY
WILL FIT ACCURATELY AND GIVE SATISFACTORY SERVICE
73
ELECTRICAL SERVICE
ELECTRICAL EQUIPMENT
LUCAS electrical equipment is fitted and this comprises three independent electrical
circuits, as follows :
(1) IGNITION—Magneto, High-tension wire and Sparking plug.
(2) CHARGING—Dynamo, Automatic Voltage Control Unit and Battery.
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(3) L I G H T I N G A N D ACCESSORIES—Lamps, Horn, Switches and wiring.
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IGNITION CIRCUIT
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A LUCAS type N1-4 magneto is fitted (Type NR1 to competition models) and the
only service attention this requires is occasional lubrication of the contact breaker cam
and tappet, infrequent adjustment of the contact breaker points and complete servicing
at intervals of about ten thousand miles. To lubricate the contact breaker cam and
tappet it is necessary to remove the complete contact breaker from the magneto.
Illustration 30
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Showing Contact Breaker
Remove contact breaker by :
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Swing away the flat blade retaining the contact breaker cover.
Pull away the contact breaker cover.
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Remove the screw E, Illustration 30, retaining the contact breaker spring arm A,
Illustration 30, to the contact breaker body and take away the backing spring F,
Illustration 31, and the spring arm E, Illustration 31. There is a spring washer under
the screw.
Unscrew the screw B, Illustration 30, carrying the lubrication wick and take away the
fibre insulating bush encircling the screw.
Straighten the tab on the lock washer D, Illustration 31, under the central screw H,
Illustration 30, retaining the contact breaker body A, illustration 31, to the armature
shaft and, with spanner 017251, remove the central screw.
Finally, lever off the contact breaker.
The above instructions do not apply to competition models fitted with Racing
Magnetos Type NR1.
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Lubricate contact breaker cam and tappet by :
Remove contact breaker as described on page 74.
Saturate, with a few drops of thin machine oil, the wick mounted in the core of its carrying screw B, Illustration 30.
Push out of the contact breaker body the tappet B, Illustration 31, wipe it with a soft cloth,
smear it with thin machine oil and then replace it.
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NOTE—When replacing the contact breaker parts, ensure the backing spring F, Illustration 31, is fitted so that its bent over end faces outwards.
Illustration 31
Contact breaker points.
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Showing component details of Contact Breaker
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The contact breaker point separation should be from .010" to .012".
Clean contact breaker points by :
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Remove the contact breaker cover.
(F, Illustration 30.)
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Examine contacts.
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If they are dirty, oily, or burnt, they must be cleaned with a fine carborundum stone,
or very fine emery cloth, and afterwards wiped with a cloth that has been moistened
with petrol.
Cleaning is made easier if the contact breaker spring arm A, Illustration 30, is removed.
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Examine the contact breaker spring arm and wipe away any rust.
Check and adjust contact breaker point setting by :
Remove contact breaker cover.
Turn over engine till the contact breaker points F, Illustration 30, are fully open.
Insert the gauge (part of spanner 017251) between the two contact points.
setting is correct the gauge should be a sliding fit.
If the
If there is an appreciable variation from the gauge slacken the lock nut G, Illustration
30, on the adjusting point and turn the contact point (apply spanner 017251 to its hexagon
head) until the gap is set to the gauge. (Screw the point into the contact breaker body
to increase the gap, or outwards, to decrease it.)
Finally, tighten the lock nut and re-check the setting.
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The foregoing instructions do not apply to competition models fitted with Racing
Magnetos Type NR1.
SPECIAL NOTE—Check the contact breaker point gap after the first one hundred miles
and five hundred miles. Owing to the initial settling down, there is a tendency
for the gap to alter in the first few hundred miles of use. This may seriously
affect the ignition setting. Subsequent adjustment will only be required at long
intervals but it is as well to check the gap every two thousand miles. (When
the engine is decarbonised is always an opportune time.)
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Complete service (dismantling, cleaning, lubrication of the armature shaft bearings, etc.)
should be entrusted to a Lucas Service Station and should be done about every ten
thousand miles.
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SPARKING PLUG
The K.L.G. Type FE80 " Corundite " Plug is fitted to all models.
It has a thread of 14 mm. and the reach is ¾". The point gap is .015". Check the point
gap every time the engine is decarbonised and, if necessary, re-set the points.
See the plug is fitted with its external seating washer.
Coat the thread with " Oil Dag " o r Graphite paste. (See page 37.)
Firmly tighten the plug by using the standard box spanner and
tommy bar (Part No. 017252.) All that is required is a GASTIGHT joint. Therefore do not over tighten, which will not
make a gas-tight joint more gas-tight, but can, and possibly will,
distort and damage the body of the plug .
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Set the gap to .015 inch. NEVER. TRY TO MOVE THE CENTRAL
ELECTRODE. To widen, or narrow, the gap between the
electrodes, only move the earth (or bent over) electrode,
Check the gap first with a gap gauge.
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If it is too wide, tap the earth electrode (the bent-over one) towards the central electrode. Use any handy metal tool to do
this, provided it is light enough in weight to be controllable.
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Check the gap between each tap and stop when the gauge is a
nice sliding fit between the two electrodes.
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If the gap is too narrow to start with, gently lever the earth
electrode away from the central electrode by using a small
screwdriver, and then tap back to the correct position.
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Do not move the electrodes apart by forcing anything between
them.
For maximum efficiency, plugs should be cleaned at every 3,000
miles. To take the plug to pieces for cleaning, unscrew the gland
nut by holding the smaller hexagon on the gland nut upside down
in a vice and then using the box spanner to unscrew the larger
hexagon on the body.
Then lift away the central electrode assembly which should be
washed in petrol or paraffin. Then, using fairly coarse glass
paper, remove the carbon deposit and wash again.
The central firing point should be cleaned with fine emery cloth.
The inside of the body should be scraped clean with a knife and
finally rinsed in petrol.
There is an internal washer, between the insulator and its seating in the body. On re-assembly lightly smear this with thin oil
and then screw up the gland nut sufficiently tight to give a gastight joint.
Finally adjust the gap to ·015"—·018".
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Illustration 32
CHARGING
A LUCAS type E3-N dynamo is fitted.
It is anti-clockwise in rotation.
The
cutting in speed is 1250-1500 r.p.m. at 7 volts and at 1,850 to 2,200 revolutions per
minute it gives an output of 5 amps at 7 volts. The replacement part number is 20028A.
The positive brush is insulated and the negative brush is earthed. The two exterior
terminals are marked " D " and " F," indicating the respective terminals for the Positive
and Field wires that lead to similarly marked terminals on the Regulator Unit.
Inspect commutator and brush gear every 5,000 to 6,000 miles.
(Maker's
Recommendation.)
Remove the dynamo (see page 78 for instructions.)
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Remove the cover band to inspect commutator and brush gear.
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The brushes are held in contact with the commutator by means of springs. Move each
brush, see they are free to slide in their holders, if dirty, or if sticking, remove and clean
with a cloth moistened with petrol. Take care to replace brushes in their original
positions, otherwise they will not " bed " properly on the commutator.
If, after long service, the brushes have become worn to such an extent that the brush
flexible wire is exposed on the running face, or if the brushes do not make good contact
with the commutator, they must be replaced by genuine LUCAS brushes.
The commutator must be free from any trace of oil or dirt and should have a highly
polished appearance. Clean a dirty, or blackened, commutator by pressing a fine dry
cloth against it while the engine is slowly turned over by means of the kick-starter.
(It is an advantage to remove the sparking plugs before doing this). If the commutator
is very dirty, moisten the cloth with petrol.
At every 10,000 miles, the complete dynamo should be handed to a Lucas Service Station
for dismantling, replacement of worn parts, cleaning and lubrication.
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Electrical breakdown of the dynamo is most unusual and therefore before assuming this
unit is defective, it should be tested as follows :
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Check that the dynamo, regulator and battery are correctly connected.
Test Dynamo in position by :
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(a) Remove the two wires from the dynamo terminals and connect the two terminals
with a short length of wire.
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(b) Start the engine and set to run at normal idling speed.
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(c) Connect the positive lead of a moving coil voltmeter (calibrated not less than 0 to
10 volts) to either of the two dynamo terminals and connect the negative lead to a
good earth point on the dynamo or engine.
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(d) Gradually increase the engine speed, when the voltmeter reading should rapidly rise
and without fluctuation.
Do not allow the voltmeter reading to rise above 10 volts.
Do not race the engine in an attempt to increase the voltage.
up the engine to a speed of 1,000 r.p.m.
It is sufficient to run
If the above reading is obtained the dynamo is in order.
If there is no reading, check the brush gear.
If there is a low reading of approximately ½ volt, the field winding may be at fault.
If there is a low reading of approximately 1½ to 2 volts, the armature winding may
be at fault.
If the tests, mentioned above, clearly indicate the dynamo is not charging, it is then
desirable to remove the dynamo from the machine in order to make further tests and
repairs or replacements.
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TO REMOVE DYNAMO
(a)
Remove Magneto chain cover,
(Retained by 6 screws.)
(b) Remove nut and its washer fixing each magneto chain sprocket.
(c) Using a sprocket withdrawal tool, or wedges behind sprocket, release, in turn,
each magneto chain sprocket and take them away, complete with chain.
(d) Remove timing gear cover (retained by 5 screws) taking care not to allow the two
camshafts to come out of engagement with the small timing pinion.
(e) Remove outer portion of front chaincase.
Remove spring circlip, lock washer, nut and plain washer under nut that retains the
chain sprocket to the dynamo armature shaft.
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(f)
(See page 43.)
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(g) Using a sprocket withdrawal tool, or wedges between sprocket and dynamo body,
release the sprocket from the dynamo shaft.
(h) Slacken nut on right-hand end of the gearbox top fixing bolt.
(i)
Remove nut on left-hand end of the gearbox bottom fixing bolt, and drive bolt out.
(It may be necessary to remove the oil return pipe from the oil tank to do this, and
this necessitates draining the oil tank first.)
(j)
Disconnect cables attached to Dynamo end cover by unscrewing central bolt fixing
the retaining plate to the cover.
(k)
Sufficiently unscrew the bolt clamping the dynamo in the engine rear plates to allow
the dynamo to have free movement.
(l)
Pull back the bottom of the gearbox as far as possible.
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TO RE-FIT DYNAMO
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(m) Rotate dynamo till the locating plate on its body is in a position to enable it to pass
the cut away parts of the engine plates, and then withdraw the dynamo from the
kick-starter side of the machine.
If camshafts have been displaced, see page 33 for
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Reverse the above procedure.
retiming instructions.
Re-set ignition timing by instructions on page 35.
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See page 51 for instructions on re-setting magneto driving chain, and, finally, check
adjustment of front and rear chains. See pages 49 and 50.
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The cut-out and regulator unit (A.V.C), is type MCR-2, and the replacement
part number is 37144-A.
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Although the voltage regulator and the cut-out are combined structurally, they are
electrically separate.
The regulator is set to maintain a pre-determined generator voltage at all speeds and
regulates the output of the dynamo to the battery according to the state of charge of the
battery. The charge rate is at its maximum when the battery is discharged, automatically
tapering off to a minimum as the battery becomes charged and its voltage rises.
Normally, during day-time running, when the battery is in good condition, the dynamo
gives only a trickle charge, so that the ammeter reading will seldom exceed 1 to 2 amperes.
The cut-out is an automatic switch which is connected between the dynamo and the battery.
When the engine is running fast enough to cause the voltage of the dynamo to exceed
that of the battery the cut-out allows the battery to be charged by the dynamo. On
the other hand, when the engine speed is low, or the engine is stationary, the cut-out
disconnects the battery from the dynamo, thereby preventing current flowing back from
the battery to the dynamo, a proceeding that would soon cause the battery to become
completely discharged.
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The regulator and cut-out are accurately set during manufacture. If, under normal
running-conditions, it is found that the battery is continually in a low state of charge, or
is being constantly over-charged, then the regulator setting should be checked by a
qualified electrician and, if necessary, re-set. Whenever possible, this should be carried
out by a Lucas Service Depot or Agent.
The A.V.C. Unit is retained to the battery carrier by two bolts with nuts. The four
terminals of the A.V.C. Unit are plainly marked by the letters F.A.D.E. Wires from
F and D go to similarly marked terminals on the dynamo. The A terminal is connected
to one of the ammeter terminals and the E terminal is " earthed."
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We specially warn against unskilled meddling with the settings of the regulator and the
cut-out contacts.
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Illustration 33
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Showing
connections
and
cut-out
to
unit
Battery
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regulator
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The battery fitted is LUCAS type PUW-7E-4. This is a lead-acid battery in which the
electrolyte is in free liquid form. The voltage is 6 and the capacity is 12 ampere hours.
The negative terminal is earthed to the frame.
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The maintenance period of a battery is expressed in terms of time and not miles, as is
general with all other parts of the machine.
The routine maintenance MUST be carried out, irrespective of if the machine is used,
or not.
Maintenance once every 14 days
Remove battery cover, brush dirt from top of battery and remove vent plugs.
are three vent plugs.)
(There
NOTE—NEVER bring a naked light near a battery when the vent plugs have been
removed, or when the battery is being charged, as the gas given off by the
electrolyte is highly explosive.
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The specific gravity of the electrolyte indicates the
state of charge of the battery. With a fully charged
battery the specific gravity of the electrolyte should
be 1·280 to 1·300. Check the gravity by means of a
hydrometer, and if it is below 1·150 the battery
should be charged as soon as possible by the normal
running of the motor cycle. If this cannot be
arranged, the battery should be charged from an
external source.
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If the level of the electrolyte is so low that a
hydrometer reading cannot be taken, no attempt
should be made to take a reading after adding
distilled w,ater until the battery has been on
charge for at least 30 minutes.
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NEVER transfer the electrolyte from one cell
to another.
NEVER leave a battery in a discharged condition.
It must be put on charge as soon as possible.
Illustration 34
Lucas PUW-7E-4
Battery
Check if the electrolyte in each cell is level with the top of the separators. Top-up, if
necessary, with distilled water. Do not allow the distilled water to come into contact
with metals—always only use a glass or earthenware container and funnel.
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If a battery is found to need an excessive amount of topping-up, steps should be taken to
find out the reason. For example, the battery may be receiving an excessive charge,
in which case the regulator setting may need adjustment. If one cell in particular needs
topping-up more than another, it is likely the case, or container, is cracked, in which event
the battery must be replaced and arrangements made to clean up the battery carrier.
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Metal parts should be well cleaned and, if possible, washed, with a solution of ammonia,
or bicarbonate of soda, in water.
Re-fix vent plugs
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Vent plugs should be kept clean and air passages in them kept free.
tightly.
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Keep the battery, and surrounding parts, particularly the tops of the cells, clean and dry.
Brush away any sand, dust or road slush.
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Battery electrolyte, which contains sulphuric acid in a diluted form, is destructive to
practically everything except rubber, lead, glass or earthenware. Therefore, rags used
to clean battery tops, etc., should be thrown away afterwards. If put back in the tool
box they will cause the tools to rust.
Assuming the temperature of the electrolyte is about 60° F. a test with a hydrometer
quickly shows the state of charge, as under :
Reading 1.280 to 1.300 indicates fully charged.
Reading about 1.210 indicates half discharged.
Reading below 1.150 indicates fully discharged.
If the electrolyte exeeds this, ·002 must be added to the hydrometer reading for each
5° F. rise to give the specific gravity at 60° F. Similarly, ·002 must be subtracted from
the hydrometer reading for every 5° F. below 60° F.
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LIGHTING A N D ACCESSORIES
Headlamp
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A LUCAS type SSU-700-P headlamp is fitted. The replacement part number is 50945-A.
It has a panel mounted on its top, retained by three screws, in which is the main switch
and ammeter and it also supports the cable harness. See Illustration 35. The main
bulb has a double filament. One filament provides the main driving beam and the other
a dipped beam, brought into operation by the dipping switch on the left handlebar as may
be required. The pilot bulb is the same as used in the rear lamp and is mounted outside
the reflector, illumination being arranged through a small circular window in the reflector.
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The reflector and front glass are made up as one assembly and the two components are
not sold as separate spares.
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The lamp is fitted with a pre-focus main bulb. The design of the bulb, and of its
holder, is such that the bulb is correctly positioned in relation to the reflector and no
focussing is required when a replacement bulb is fitted.
Illustration 35
Showing lamp panel containing ammeter (at top) switch and cable harness.
The ammeter fitted is type CZ-427 and the replacement part number is 36084.
(See page 84 for numbered references.)
To remove the headlamp rim and light unit
Slacken the screw on the top of the lamp body at the front, pull the rim outward from the
top and, as the front comes away, lower slightly to disengage the bottom tag from the
lamp shell. Twist the back shell in an anti-clockwise direction and pull it off, the bulb can
then be removed. The light unit is secured to the rim by means of spring clips.
These can be disengaged from the turned up inner edge of the rim by pressing with a
screwdriver blade and, at the same time, working away from the edge.
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To replace the headlamp rim and light unit
Lay the light unit in the rim so that the location block on the unit back engages with
the forked bracket on the rim.
Replace, by springing in, the spring clips so that they are evenly spaced around the rim.
To replace the back shell engage the projections on the inside of the back shell with
the slots in the holder, press on and secure by twisting it to the right.
NOTE.—Take care to engage the back shell correctly so that the pilot bulb is opposite
the aperture provided in the light unit.
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Engage bottom tag on lamp rim with the small slit in the shell and gently force the top
of the rim back into the shell, after which re-tighten the locking screw on the top of the
lamp body.
Rear lamp
A LUCAS type 467/2 rear lamp is fitted. The body, with bulb holder, is secured to the
rear number plate by two nuts and spring washers.
The cover, carrying the red glass, is secured to the body by a sleeve nut. Upon
removing this nut, the cover and glass may be taken away to permit bulb replacement.
Details of lamp bulbs are given in " D A T A . "
Horn
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The horn push switch, situated on the right handlebar.
Fuses
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Snap wire connector
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There are no detachable fuses in LUCAS motor cycle electrical equipment.
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The LUCAS snap connector, as shown in illustration 36, is made up of four components.
Two are tubular sleeves, having pointed extremities, and which are soldered to the ends
of the two wires to be connected. The third part is the centre split ferrule, into which
the two sleeves snap and the fourth component is a rubber sleeve which covers the whole
connector. That rubber sleeve serves the dual purpose of insulating the various metal
parts and also preventing same from separation as the result of vibration.
Illustration 36
Lucas snap connector
Part number 900269
One snap connector is used in the rear lamp wire (the wires have red coloured sleeves)
and another is used in the wire connecting the regulator unit to the output side of the
ammeter in the head lamp. (The wires have purple and white coloured sleeves.)
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Screwed wire connector
Illustration 37
Lucas screwed wire connector
Part number 571395
Terminals
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A LUCAS screwed connector of the type shown in Illustration 37 is used in the wire
connecting the positive terminal of the battery to the input side of the ammeter (the
wire has yellow and black coloured sleeves) in the head lamp. It is made up of four
parts. One part, a metal sleeve, is threaded internally and accommodates a collet
which is placed on the end of one of the wires to be connected in such a manner that the
wire ends protrude through the centre of the collet. The third metal part screws
Into the first and has passing through it the second of the wires to be connected.
The wire ends are splayed out and the act of screwing the two threaded parts together
binds the ends of the two wires, thereby making a good electrical contact that can be
immediately broken as, and when, it is wished to remove the battery from the machine.
A rubber sleeve encircles the whole assembly, serving the dual purpose of insulation and
prevention of loss through vibration.
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The earth wires (two—one from regulator, the other from negative terminal of battery)
and the high-tension wires (two—one on sparking plug end of each wire from magneto
to sparking plug) have terminals of the solid sleeve type having an eye at the extreme end.
To make such a connection, it is necessary to bare the end of the wire for a", pass the
terminal over the wire so that the bared end fully enters the reduced core of the terminal
and then flatten that part by either pinching in a vice or by hammering.
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The two earth wires, mentioned above, are connected to the " earth " by securing them
to the left side of the seat lug bolt (which is situated just under the saddle) by means of a
washer and a screw. It is essentia! that the connections are kept clean and the screw
must be kept fully tight.
WHEN ORDERING SPARES, IF IN DOUBT REGARDING THE NAMES
AND PART NUMBERS OF THE PARTS YOU REQUIRE, PLEASE
SEND THE OLD PARTS TO SERVE AS PATTERNS.
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MAIN
BULB
PILOT
BULB
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AMMETER
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LIGHTING SWITCH
DIPPER SWITCH
SPEEDO ILL.
HORN PUSH
DYNAMO
TO SPARKING
PLUG
SNAP
CONNECTOR
MAGNETO
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REGULATOR
BATTERY
CONNECTOR
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HORN
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BATTERY
(NEGATIVE EARTH)
TAIL LAMP
Illustration 38
Wiring diagram
(See page 96 for key to the cable numbers and colours.)
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USEFUL INFORMATION
In the following five paragraphs are particulars of failures and troubles that can occur,
together with the probable reasons. These troubles are arranged in the order of their
probability.
TRACING TROUBLES
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Throttle opening too large.
Air [evert in open position.
Ignition not set just off fully advanced position. .
Lack of fuel because of insufficient flooding.
Lack of fuel because of pipe, or tap, obstruction.
Excessive flooding of carburetter.
Pilot jet chocked.
Oiled up, or fouled, sparking plug.
Stuck up engine valve.
Weak, or broken, valve spring.
Valve not seating properly.
Contact points dirty.
Incorrect contact point gap.
Water on high-tension pick-up.
Moisture on sparking plug.
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Engine fails to start, or is difficult to start, may be due to :
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Engine misses fire may be due to :
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Defective, or oiled, sparking plug.
Incorrect contact point gap.
Contact breaker rocker arm sticking.
Contact breaker points loose.
Rocker adjustment incorrect.
Oil on contact breaker points.
Weak valve springs.
Defective sparking plug wire.
Partially obstructed petrol supply.
Loss of power may be due to :
Faulty sparking plug.
Lack of oil in tank.
No rocker clearance, or too much clearance.
Weak, or broken, valve spring.
Sticky valve stem.
Valve not seating properly.
Brakes adjusted too closely.
Badly fitting, or broken, piston rings.
Punctured carburetter float.
Engine carbonised.
Choked silencer.
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Lack of proper lubrication. (Quality or quantity of oil.)
Faulty sparking plug.
Air control to carburetter out of order.
Punctured carburetter float.
Engine carbonised.
Weak valve springs.
Pitted valve seats.
Worn piston rings.
Ignition setting incorrect.
Choked silencer.
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Engine stops suddenly may be due to :
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Engine overheats may be due to :
No petrol in tank, or choked petrol supply.
High-tension wire detached from sparking plug.
Choked main jet.
Oiled up, or fouled, sparking plug.
Water on high-tension pick-up, or sparking plug.
Water in float chamber.
Vent hole in petrol tank filler cap choked.
EXCESSIVE OIL CONSUMPTION
Excessive oil consumption may be due to :
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(a) Clogged, or partly clogged, oil filter.
(b) Stoppage, or partial stoppage, in the pipe returning oil from the engine to the oil
tank.
(c) Badly worn, or stuck up, piston rings. (Causing high pressure in the crankcase.)
(d) Air leak in dry sump oiling system.
(e) Worn inlet valve stems.
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EXCESSIVE PETROL CONSUMPTION
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Excessive petrol consumption may be due to :
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(a) Leaks in the petrol feed system. (Damaged fibre washers, loose union nuts on
piping, defective float needle action.)
(b) Incorrect ignition setting. (Ignition not advanced sufficiently.)
(c) Defective engine valve action.
(d) Incorrect use of air control lever.
(e) Moving parts of carburetter badly worn. (Only possible after very considerable
mileage.)
(f) Bad air leak at carburetter junction, or inlet manifold joint,
ABNORMAL TYRE WEAR
Abnormal tyre wear may be due to :
(a) Incorrect tyre pressure.
(b) Wheels not in alignment.
(c) Harsh driving methods. (Misuse of acceleration and braking.)
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CLEANING THE MACHINE
Do not attempt to rub, or brush, mud off the enamelled surfaces because this will soon
destroy the sheen of the enamel. Mud, and other road dirt, should be soaked off with
water.
The best method is to use a small hose, taking care not to direct water on to the engine,
carburetter, magneto and other such parts. As a poorer substitute, a pail of water and
a sponge may be used.
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After washing down with water, the surplus moisture should be removed with a chamois
leather, and, when the enamelled surfaces are thoroughly dry, they may be polished
with a good wax polish and soft dusters.
CHROMIUM PLATING
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Such parts as the engine crankcase and the gear box can be cleaned by applying paraffin
with a stiff brush, and, with a final application of petrol, will come up like new.
Under some climatic conditions, a rusty looking deposit may be observed on ferrous
parts that are chromium plated. This is not ordinary rust (ferric oxide) but is a salt
deposit that, in most cases and in its early stages, can be quickly and easily removed with a
damp chamois leather. In stubborn cases it may be necessary to use a special chromium
cleaning compound.
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The safest precaution during Winter is to wipe over all chromium plated parts with a
soft rag in " T E K A L L , " which is a lanoline base rust preventative marketed in small
tins and available at most garages. This material, so applied, leaves an almost invisible
film that is impervious to moisture and its use cannot be too highly recommended to
owners who value the appearance of their mounts.
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In Summer, when those conditions do not prevail, chromium parts should be frequently
cleaned with a damp chamois leather and afterwards polished with a soft duster, or,
better still, with a polisher of the " Selvyt " type.
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If a polish is used it must be one of the special compounds for chromium plating only.
Ordinary metal polishing liquids, in particular, must not, on any account, be used because
these, almost without exception, contain acids, which attack chromium.
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NOTE—" Tekall " is a product of 20th Century Finishes Ltd., 175-177, Kirkgate,
Wakefield, and is retailed in ½ pint and 1 pint tins. It can be obtained from
our Spare Parts Department, as follows :
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½ pint tin " Tekall," Part number 011957, price 2 / - , plus 6d. postage.
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1 pint tin " Tekall," Part number 011958, price 2/6, plus 6d. postage.
REPAIRS
The instructions regarding repairs should be clear and definite, otherwise the cost may
be greater than that expected. We shall be pleased to give estimates for repairs if
parts are sent to us for that purpose. If the estimate is accepted, no charge is made for
She preliminary examination, but, should it be decided not to have the work carried out,
it MAY be necessary to make a charge to cover the cost of whatever dismantling and
re-assembly may have been done to prepare the estimate.
Customers desiring that old parts which are replaced with new during the course of
overhaul or repair be retained must make the fact known prior to the work being put
in hand because, normally, such parts, having no further useful life, are scrapped upon
removal.
87
Parts sent to us as patterns, or for repair, should have attached to them a label bearing
the sender's full name and address. The instructions regarding such parts should be
sent under separate cover.
If it is necessary to bring a machine, or parts, to the Works for an urgent repair, IT IS
ESSENTIAL you MAKE AN APPOINTMEN T beforehand to A V O I D DISAPPOINTMENT. This can be done by letter or telephone.
CORRESPONDENCE
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Our routine is organised into different departments, therefore delay cannot be avoided
if matters relating to more than one department are contained in one letter.
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Consequently, it is desirable, when communicating with more than one department,
to do so on SEPARATE SHEETS, each of which should bear your name and address.
IN PARTICULAR, requests for T E CHNI CA L ADVICE should not be on the same
sheets as ORDERS FOR SPARE PARTS.
When writing on a technical matter, or when ordering spares, it is essential to quote
the COMPLETE ENGINE NUMBER. Some numbers have one, or more, letters
incorporated in them and these letters MUST BE Q U O T E D , otherwise model identification is not possible.
PROPRIETARY FITTINGS
No expense is spared to secure and fit the most suitable, and highest quality, instruments
and accessories for the standard equipment of our machines.
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Nevertheless, our Guarantee does not cover such parts and, in the event of trouble
being experienced, the parts in question should be returned to, and claims made, direct
on the actual manufacturers who will deal with them on the terms of their respective
guarantees.
Those manufacturers are :
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Chains
Messrs. Amalgamated Carburetters Ltd.,
Holford Works, Perry Barr, Birmingham.
The Renold and Coventry Chain Co. Ltd.,
Didsbury, Manchester.
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Carburetters
Messrs. Joseph Lucas Ltd.,
Great King Street, Birmingham, 19.
Gear boxes
Messrs. Burman and Sons Ltd.,
Wychall Lane, King's Norton, Birmingham, 13.
Sparking Plugs
K.L.G. Sparking Plugs Ltd.,
Putney Vale, London, S.W.15.
Speedometers
Messrs. S. Smith and Sons (M.A.) Ltd.,
Cricklewood, London.
Tyres
Messrs. Dunlop Rubber Co. Ltd.,
Fort Dunlop, Birmingham.
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Electrical equipment
All the above manufacturers issue instructive literature regarding their products which
is obtainable by writing to them.
88
SERVICE
The Service and Repair Department is situated in Burrage Grove, Plumstead,
London, S.E.18. and is open on Mondays to Fridays from 8.30 a.m. to 12.55 p.m.—2.0
p.m. to 5.30 p.m. It is closed on Saturdays, Sundays and National Holidays.
It exists for the purposes of :
(a) Giving technical assistance verbally or through the post.
(b) Supplying spare parts over the counter or through the post.
(c) Repairing and re-conditioning machines, or parts of machines, of our make.
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Burrage Grove is the first turning on the left from Burrage Road when entering
Burrage Road from the Plumstead Road. (See final paragraph below.)
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The nearest Railway Station is WOOLWICH ARSENAL, SOUTHERN REGION
RAILWAY. This Station is five minutes walk from our Service Depot in Burrage
Grove. There is an excellent service of electric trains from Charing Cross, Waterloo,
Cannon Street and London Bridge Stations, Southern Region Railway.
Bus routes 53, 53a, 54, 99 and 122. Trolleybus routes, 696 and 698, and Tram routes
36, 38 and 40, pass the end of Burrage Road (one minute from the Service Depot).
Bus routes 21a, 75 and 161 and Tram routes 44, 46 and 72 serve Beresford Square
which is three minutes walk from the Service and Repair Department.
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Visitors from the North can pass into Woolwich via the Free Ferry between North
Woolwich and Woolwich. North Woolwich is a British Railways terminus and is also
served by Bus and Trolleybus routes 101, 569, 669 and 685. There is also a tunnel
under the River Thames at this point for foot passengers. The Free Ferry accommodates all types of motor vehicles and there is a very frequent service. The Southern
landing stage is less than a mile from the Service Depot.
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Visitors arriving by road, if they are strangers to the locality, should enquire for
Beresford Square, Woolwich. Upon arrival there the road skirting the Royal
Arsenal should be followed in an Easterly direction for about four hundred yards, and
Burrage Road is the second turning on the right after leaving the Square. Burrage
Grove is then the first turning on the left.
THE DRIVER AND THE LAW
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The driver of a motor cycle MUST be INSURED against Third Party Claims and MUST
be able to produce an INSURANCE CERTIFICATE showing that such an insurance
is in force.
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If your Insurance Certificate specifies you can only drive one particular machine you
MUST N O T DRIVE any other machine unless its owner has a current Certificate
covering " A N Y DRIVER " and it is advisable to remember that, in the absence of
such a provision the penalties for doing so are very heavy.
The driver of a motor cycle MUST hold a current DRIVING LICENCE. If you are a
learner and hold a Provisional Driving Licence, your machine must show, front and
back, the standard " L " plates in red and white and you must not take a PILLION
PASSENGER unless that passenger is the holder of a current UNRESTRICTED
driving licence.
As soon as you receive your driving licence, sign it in the appropriate place and do so
each time it is renewed. It is an offence not to.
Make sure you are well acquainted with the recommendations set down in the " Highway
Code," a copy of which can be obtained from any main Post Office.
89
THE MACHINE A N D THE L AW
Every motor cycle used on the public roads must be registered and carry the registration
numbers and licence disc allotted to it. The dealer, from whom the machine is bought,
will, generally, attend to all matters legally essential before it is used on the public roads.
To register a new machine
Send to the Local Registration Authority the following :
(a) Form " RF1/2," duly completed.
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(b) The certificate of insurance.
(c) The invoice you received from your dealer when you purchased the machine.
In due course you will receive :
(1) A Registration Book.
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(d) The appropriate registration fee.
(Commonly called the " log " book.)
(2) A Licence Disc.
(3) Your Insurance Certificate.
(4) Your Invoice.
The Registration Book and the Licence Disc will bear the registration numbers that have
been allotted to your machine and will also show the date the Road Licence expires.
Your number plates must then be painted, in white upon a black background, with the
registration numbers in characters of even thickness as follows :
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The numbers on the front plate must be 1¾" high, 1¼" wide and c" thick with spaces of
½" between each two characters.
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The numbers on the rear plate must be 2½" high, 1¾" wide and a" thick with spaces
½" between each two characters.
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The Licence Disc must be enclosed in a water-tight container, having a transparent front,
and this must be fixed to the machine in a conspicuous position, near the front and on
the left-hand side.
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It is not legally necessary to carry your Driving Licence, Insurance Certificate and
Registration Book while driving your machine.
Speedometer
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A speedometer MUST be fitted and it MUST BE so ILLUMINATED that it is possible
to read the dial after lighting up time.
Lamps
During the official " LIGHTIN G UP " hours the machine must exhibit a white light
facing forwards and a red light facing rearwards. The rear number plate must be
adequately illuminated by a white light.
Each electric light bulb MUST be marked with its
imported, bulbs that do not have this marking.)
"Wattage."
(Beware of cheap,
All motor cycles made by us have electric equipment that complies with the law regarding
position, size of bulbs, marking on bulbs and the correct illumination of the rear number
plate.
90
GUARANTEE
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We give the following guarantee with our motorcycles, motorcycle combinations and sidecars,
which is given in place of any implied conditions, warranties or liabilities whatsoever, statutory or
otherwise, all such implied conditions, warranties and liabilities being in all cases excluded. Any
statement, description, condition or representation contained in any catalogue, advertisement,
leaflet or other publication shall not be construed as enlarging, varying or overriding this guarantee.
In the case of machines (a) which have been used for " hiring-out " purposes or (b) any motorcycle
and/or sidecar used for any dirt track, cinder track or grass track racing or competitions (or any
competition of any kind within an enclosure for which a charge is made for admission to take part
in or view the competition) or (c) machines from which the trade mark, name or manufacturing
number has been removed, no guarantee, condition or warranty of any kind is given or is to be
implied.
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We guarantee, subject to the conditions mentioned below, that all precautions which are usual and
reasonable have been taken by us to secure excellence of materials and workmanship, but this
guarantee is to extend and be in force for six months only from date of purchase, and damages for
which we make ourselves responsible under this guarantee are limited to the free supply of a new
part in exchange for the part of the motorcycle, motorcycle combination or sidecar which may
have proved defective. We do not undertake to replace or refix, or bear the cost of replacing or
refixing, such new part in the motorcycle, motorcycle combination or sidecar. We undertake,
subject to the conditions mentioned below, to make good at any time within six months any defects
in these respects.
As motorcycles, motorcycle combinations and sidecars are easily liable to
derangement by neglect, or misuse, this guarantee does not apply to defects caused by wear and
tear, misuse or neglect.
The term " misuse " shall include amongst others the following acts :—
1. The attaching of a sidecar to a motorcycle in such a manner as to cause damage or
calculated to render the latter unsafe when ridden.
The use of a motorcycle or of a motorcycle and sidecar combined, when carrying more
persons or a greater weight than that for which the machine was designed by the
manufacturers.
3.
The attaching of a sidecar to a motorcycle by any form of attachment not provided,
supplied or approved by us or to a motorcycle which is not designed for such use.
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2.
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Any motorcycle, motorcycle combination or sidecar sent to us to be plated, enamelled or repaired
will be repaired upon the following conditions, i.e., we guarantee that all precautions which are usual
and reasonable have been taken by us to secure excellence of materials and workmanship, such
guarantee to extend and be in force for three months only from the time such w o r k shall have been
executed or until the expiration of the six months above referred t o , and this guarantee is in lieu
and in exclusion of any common law or statute warranty or condition, and the damages recoverable
are limited to the cost of any further w o r k which may be necessary to amend and make good the
w o r k found to be defective.
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CONDITIONS OF GUARANTEE
If a defective part should be found in our motorcycles, motorcycle combinations or sidecars, or in
any part supplied by way of exchange before referred to, it must be sent to us CARRIAGE PAID
and accompanied by an intimation from the owner that he desires to have it repaired or exchanged
free of charge under our guarantee, and he must also furnish us at the same time with the number
of the machine, the date of the purchase or the date when the alleged defective part was exchanged
as the case may be.
Failing compliance with the above, such articles will lie here AT THE RISK OF THE OWNER, and
this guarantee and any implied guarantee, warranty or condition shall not be enforceable.
We do not guarantee specialities such as tyres, saddles, chains, electrical equipment, lamps, etc., or
any component parts supplied to the order of the Purchaser differing from standard specifications
supplied w i t h our motorcycles, motorcycle combinations, sidecars or otherwise.
91
TOOLS AND SPECIAL EQUIPMENT
TOOLS
The standard tool kit, issued with each new machine, contains :
017253
Tool bag.
1
017114
Tyre inflator.
2
017007
Tyre levers.
1
017248
Pliers.
1
011188
Gudgeon pin circlip pliers.
1
017256
Screwdriver.
1
017246
Grease gun.
1
017249
Adjustable wrench.
1
017252
Sparking plug box spanner and tommy bar.
1
017254
Dynamo spanner.
1
017255
Triple spanner.
2
017052
Double end spanner.
Small.
1
017053
Double end spanner.
Large.
1
017251
Contact point spanner and gauge (Not Competition).
1
015023
Contact point spanner and gauge (Competition).
1
017250
Hub lock nut hook spanner. (Front hub bearings and rear
hub on rigid frame models.)
1
010438
Hub lock nut hook spanner (rear hub bearings on spring
frame models).
1
017257
Double end spanner.
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OPTIONAL EQUIPMENT
They are described and
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The following items of optional equipment are available.
priced in the Spares List.
Air cleaner.
(b)
Mudguard type pillion seat.
(c)
Pillion footrests, bolted on, to fold up when not in use and specially designed for
these machines. (Not on competition)
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(a)
Detachable luggage carrier.
(e)
Timing disc 015955. A circular timing disc, graduated in degrees and made of
ivorine. A very useful device.
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(d)
(Not on competition).
(f)
Valve holder, for valve grinding.
(g)
Valve spring compressor.
(h)
Pannier frames and bags for spring frame and rigid models.
Part number 017482.
Part number 014605.
(See page 29).
SPARES LIST
An illustrated and priced spares list is available at a cost of 2/6 post free. (See page 29).
GASKET SETS
For convenience in ordering, standard sets of engine washers and gaskets as well as the
washers used in the petrol and oil feed systems are stocked. Full details of contents
and prices are included in the Spares List.
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BADGES
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Neat monogram badges are now available at a cost of 1/6, plus 6d. postage. They can
be supplied as a tie pin, as a brooch or for fitting in a button hole. When ordering
state type required.
Illustration 39
93
ILLUSTRATIONS
Illustrations Page
Battery
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Brake adjustment, front …
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80
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Brake adjustment, rear (rigid frame)
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Brake adjustment, rear (spring frame)
Brake shoe adjustment …
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70
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Clutch
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Clutch lever
Contact breaker …
Contact breaker details
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9
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Fork component details …
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Fork damper details
Gear box …
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Gear lever positions
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Hub bearing details
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Hub, rear …
Kick-starter engagement
Lamp panel
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Leg, teledraulic, rear
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Lubrication chart
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Oil tank
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Oil pump …
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Rear spring frame
Sparking plug
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Tank fixing details …
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Valve spring compressor
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Wire connector, snap type
Wire connector, screwed type …
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Wiring diagram, theoretical
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Cut-out unit
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Engine lubrication
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Flywheels …
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Tappet adjustment
Timing valve, inlet only …
Timing valve, exhaust only
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Tools
Valve lubrication
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Controls
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Carburetter
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Brake pedal adjustment …
27
94
5
10
30
20
56
19
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16
41
3
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24
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23
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2
10
35
81
59
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76
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26
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34
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39
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6
19
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29
36
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37
83
38
84
INDEX
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SPARES AND SERVICE
DEPARTMENTS
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39
8
4
10
74
26
25
52
91
2
15
22
23
89
58
87
89
92
42
85
62
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Carburetter Service
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Controls
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Data …
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Driving
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Electrical Service
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Engine Service
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Free Service …
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Fork and Frame Service
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Guarantee …
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Introduction …
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Lubrication …
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Lubrication Chart …
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Maintenance …
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Service
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Rear teledraulic legs
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Repairs
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The Law
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Tools and Special Equipment
Transmission Service
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Useful Information …
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Wheel, Brake and Tyre Service
HOURS OF BUSINESS
FOR CALLERS
MONDAYS
8.30 a.m. to 12.55 p.m.
2.0 p.m. to 5.30 p.m.
TUESDAYS
Ditto
WEDNESDAYS
Ditto
THURSDAYS
Ditto
FRIDAYS
Ditto
NOT OPEN ON NATIONAL HOLIDAYS
95
KEY TO THE COLOURED
IDENTIFICATION BANDS ON
THE NUMBERED CABLES
SHOWN IN THE WIRING
D I A G R A M ON PAGE 84.
15 BLUE and WHITE
7 RED and BLACK
23 WHITE and PURPLE
8 YELLOW
28 GREEN and BLACK
14 BLUE
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13 YELLOW and BLACK
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1 RED
31 PURPLE
33 BLACK
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GENUINE
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A • J • S SPARES
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PURCHASED FROM
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AN AUTHORISED
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FROM
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WITH
BY
USING
"A•J•S"
THE
FACTORY,
THE
PARTS
DEALER
ARE
OR
IDENTICAL
ORIGINALLY
BUILT
INTO YOUR MOTOR CYCLE.
GENUINE
SPARES
YOU
ARE
ASSURED
THEY
WILL FIT ACCURATELY AND GIVE SATISFACTORY SERVICE
96
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